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重型工业燃气轮机的投资及单位功率能耗指标一般高于航空改型燃气轮机。The investment and energy consumption per unit power of heavy industrial gas turbine is generally higher than that of aviation modified gas turbine.
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更多 “重型工业燃气轮机的投资及单位功率能耗指标一般高于航空改型燃气轮机。The investment and energy consumption per unit power of heavy industrial gas turbine is generally higher than that of aviation modified gas turbine.” 相关考题
考题
The thermal energy of the steam is converted into ( ) energy by the turbine.
A.electricalB.mechanicalC.chemicalD.potential
考题
What is an advantage of diesel over steam turbine propulsion ________．A.Less fuel consumption per SHPB.Diesel fuel costs less than bunker C or its equivalentC.Less routine maintenance requiredD.Less weight per SHP
考题
共用题干
Natural Gas1 Natural gas is produced from reservoirs deep beneath the earth's surface. It is a fossil fuel（矿物燃 料）,meaning that it is derived from organic material buried in the earth millions of years ago.The main corn- ponent of natural gas is methane（甲烷）.2 The popularity and use of clean natural gas have increased dramatically over the past 50 years as pipeline infrastructure（基础设施）has been installed to deliver it conveniently and economically to millions of residential,commercial and industrial customers worldwide.Today,natural gas service is available in all 50 states in the U.S.,and is the leading energy choice for fueling American homes and industries.More than 65 million American homes use natural gas.In fact,natural gas is the most economical source for home energyneeds,costing one-third as much as electricity. In addition to heating homes,much of the gas used in the United States is used as a raw material to manufacture a wide variety of products,from paint,to fibers for clothing,to plastics for healthcare,computing and furnishings.Natural gas is also used in a significant number of newelectricity-generating power plants.3 Natural gas is one of the safest and cleanest fuels available. It emits（发出）less pollution than other fossil fuels sources. When natural gas is burned,it produces mostly carbon dioxide（二氧化碳）and water va- por一the same substances emitted when humans breathe.Compared with some other fossil fuels,natural gas emits the least amount of carbon dioxide into the air when combusted（燃烧）一making natural gas the clea-- nest burning fossil fuel of all.4 The United States consumes about one-third of the world's natural gas output,making it the largest gas-consuming region in the world.The U.S.Department of Energy Information Administration forecasts thatnatural gas demand will grow by more than 50 percent by 2025.5 There are huge reserves of natural gas beneath the earth's surface.The largest reserves of natural gas can be found in Russia , West and North Africa and the Middle East. LNG（液化天然气）has been pro- duced domestically and imported in the United States for more than four decades.Today,the leading import-ers of LNG are Japan,Korea,France and Spain.Natural gas is recognized as the most economical energy source______________.A:over the past 50 yearsB:beneath the earth's surfaceC:by more than 50 percentD:for more than four decadesE:as a raw materialF:for home energy needs
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共用题干
Natural Gas1 Natural gas is produced from reservoirs deep beneath the earth's surface. It is a fossil fuel（矿物燃 料）,meaning that it is derived from organic material buried in the earth millions of years ago.The main corn- ponent of natural gas is methane（甲烷）.2 The popularity and use of clean natural gas have increased dramatically over the past 50 years as pipeline infrastructure（基础设施）has been installed to deliver it conveniently and economically to millions of residential,commercial and industrial customers worldwide.Today,natural gas service is available in all 50 states in the U.S.,and is the leading energy choice for fueling American homes and industries.More than 65 million American homes use natural gas.In fact,natural gas is the most economical source for home energyneeds,costing one-third as much as electricity. In addition to heating homes,much of the gas used in the United States is used as a raw material to manufacture a wide variety of products,from paint,to fibers for clothing,to plastics for healthcare,computing and furnishings.Natural gas is also used in a significant number of newelectricity-generating power plants.3 Natural gas is one of the safest and cleanest fuels available. It emits（发出）less pollution than other fossil fuels sources. When natural gas is burned,it produces mostly carbon dioxide（二氧化碳）and water va- por一the same substances emitted when humans breathe.Compared with some other fossil fuels,natural gas emits the least amount of carbon dioxide into the air when combusted（燃烧）一making natural gas the clea-- nest burning fossil fuel of all.4 The United States consumes about one-third of the world's natural gas output,making it the largest gas-consuming region in the world.The U.S.Department of Energy Information Administration forecasts thatnatural gas demand will grow by more than 50 percent by 2025.5 There are huge reserves of natural gas beneath the earth's surface.The largest reserves of natural gas can be found in Russia , West and North Africa and the Middle East. LNG（液化天然气）has been pro- duced domestically and imported in the United States for more than four decades.Today,the leading import-ers of LNG are Japan,Korea,France and Spain.Paragraph 4 ______________A:Popularity and Use of Natural GasB:Natural Gas Reserves and SupplyC:Natural Gas PricesD:Clean Fuel of ChoiceE:Disadvantages of Natural Gas F:Natural Gas Consumption
考题
共用题干
Natural Gas1 Natural gas is produced from reservoirs deep beneath the earth's surface. It is a fossil fuel（矿物燃 料）,meaning that it is derived from organic material buried in the earth millions of years ago.The main corn- ponent of natural gas is methane（甲烷）.2 The popularity and use of clean natural gas have increased dramatically over the past 50 years as pipeline infrastructure（基础设施）has been installed to deliver it conveniently and economically to millions of residential,commercial and industrial customers worldwide.Today,natural gas service is available in all 50 states in the U.S.,and is the leading energy choice for fueling American homes and industries.More than 65 million American homes use natural gas.In fact,natural gas is the most economical source for home energyneeds,costing one-third as much as electricity. In addition to heating homes,much of the gas used in the United States is used as a raw material to manufacture a wide variety of products,from paint,to fibers for clothing,to plastics for healthcare,computing and furnishings.Natural gas is also used in a significant number of newelectricity-generating power plants.3 Natural gas is one of the safest and cleanest fuels available. It emits（发出）less pollution than other fossil fuels sources. When natural gas is burned,it produces mostly carbon dioxide（二氧化碳）and water va- por一the same substances emitted when humans breathe.Compared with some other fossil fuels,natural gas emits the least amount of carbon dioxide into the air when combusted（燃烧）一making natural gas the clea-- nest burning fossil fuel of all.4 The United States consumes about one-third of the world's natural gas output,making it the largest gas-consuming region in the world.The U.S.Department of Energy Information Administration forecasts thatnatural gas demand will grow by more than 50 percent by 2025.5 There are huge reserves of natural gas beneath the earth's surface.The largest reserves of natural gas can be found in Russia , West and North Africa and the Middle East. LNG（液化天然气）has been pro- duced domestically and imported in the United States for more than four decades.Today,the leading import-ers of LNG are Japan,Korea,France and Spain.Natural gas is stored deep______________.A:over the past 50 yearsB:beneath the earth's surfaceC:by more than 50 percentD:for more than four decadesE:as a raw materialF:for home energy needs
考题
共用题干
Natural Gas1 Natural gas is produced from reservoirs deep beneath the earth's surface. It is a fossil fuel（矿物燃 料）,meaning that it is derived from organic material buried in the earth millions of years ago.The main corn- ponent of natural gas is methane（甲烷）.2 The popularity and use of clean natural gas have increased dramatically over the past 50 years as pipeline infrastructure（基础设施）has been installed to deliver it conveniently and economically to millions of residential,commercial and industrial customers worldwide.Today,natural gas service is available in all 50 states in the U.S.,and is the leading energy choice for fueling American homes and industries.More than 65 million American homes use natural gas.In fact,natural gas is the most economical source for home energyneeds,costing one-third as much as electricity. In addition to heating homes,much of the gas used in the United States is used as a raw material to manufacture a wide variety of products,from paint,to fibers for clothing,to plastics for healthcare,computing and furnishings.Natural gas is also used in a significant number of newelectricity-generating power plants.3 Natural gas is one of the safest and cleanest fuels available. It emits（发出）less pollution than other fossil fuels sources. When natural gas is burned,it produces mostly carbon dioxide（二氧化碳）and water va- por一the same substances emitted when humans breathe.Compared with some other fossil fuels,natural gas emits the least amount of carbon dioxide into the air when combusted（燃烧）一making natural gas the clea-- nest burning fossil fuel of all.4 The United States consumes about one-third of the world's natural gas output,making it the largest gas-consuming region in the world.The U.S.Department of Energy Information Administration forecasts thatnatural gas demand will grow by more than 50 percent by 2025.5 There are huge reserves of natural gas beneath the earth's surface.The largest reserves of natural gas can be found in Russia , West and North Africa and the Middle East. LNG（液化天然气）has been pro- duced domestically and imported in the United States for more than four decades.Today,the leading import-ers of LNG are Japan,Korea,France and Spain.It is estimated that by 2050 the natural gas demand in the United States will increase______________.A:over the past 50 yearsB:beneath the earth's surfaceC:by more than 50 percentD:for more than four decadesE:as a raw materialF:for home energy needs
考题
The world's energy watchdog has sounded the alarm over a"worrying"pause in the shift to clean energy after global investment in renewables fell 7%to$318bn（~240bn）last year.The International Energy Agency said the decline is set to continue int0 2018,threatening energy security,climate change and air pollution goals.Fossil fuels increased their share of energy supply investment for the first time since 2014,to$790bn,and will play a significant role for years on current trends,the IEA said.Investment in coal power dropped sharply but was offset by an uptick in oil and gas spending,the World Energy Investment repoit found..Dr Fatih Birol,the executive director of the IEA,said of the renewables fall:"We are seeing a decrease,which is disappointing.And more disappointing is we see the signs this decline may continue this year-this is a worrying trend."Fossil fuels'share of energy investment needs to drop t0 40%by 2030 to meet climate targets but instead rose fractionally t0 59%in 2017.World leaders'warm words on renewables and energy efficiency needed to be matched with action,Birol said,urging govemments to create less investment uncertainty for green energy.Globally,energy investment fell 2%to$1.8tn in 2017,with electricity taking a bigger share than oil and gas for the second year in a row.The decline in renewable power generation spending was mostly down to falls in wind power and hydro but solar hit record levels despite becoming cheaper to install.While coal investment fell to its lowest level in 10 years,spending on gas-fired power stations rose 40%.Nuclear power fell sharply to the lowest level of investment in five years.In the oil and gas industry,rising prices have helped investment in production rise 4%last year and is expected to grow 5%this year.The US's shale boom will drive much of the groivth,and frackers are on track to achieve positive free cashflow this year,for the first time.The US is not expected to pump enough extra crude to bring down oil prices,though.Birol said"Us shale growth is very welcome growth for badly needed additions but this growth alone will not be enough to balance out the markets.Outside the US,investment in conventional oil and gas projects remains subdued and Birol said the world faced"major difficulties"if investment was not stepped u Motorists spent S 43bn on fully electric cars and plug-in hybrids last year,accounting for half of global growth in car sales.However,the battery-powered cars are not seriously denting oil demand yet the IEA said Governments are increasing investment in energy markets,either directly through state-owned firms or indirectly via investments policies and regulation,which Birol said was a surprising development
Birol suggested that the leaders shouldA.ensure the supply of green energy
B.call for the public to use the new ener
C.match the energy efficiency with the new ener
D.spur sustained investment in renewable energy
考题
The world's energy watchdog has sounded the alarm over a"worrying"pause in the shift to clean energy after global investment in renewables fell 7%to$318bn（~240bn）last year.The International Energy Agency said the decline is set to continue int0 2018,threatening energy security,climate change and air pollution goals.Fossil fuels increased their share of energy supply investment for the first time since 2014,to$790bn,and will play a significant role for years on current trends,the IEA said.Investment in coal power dropped sharply but was offset by an uptick in oil and gas spending,the World Energy Investment repoit found..Dr Fatih Birol,the executive director of the IEA,said of the renewables fall:"We are seeing a decrease,which is disappointing.And more disappointing is we see the signs this decline may continue this year-this is a worrying trend."Fossil fuels'share of energy investment needs to drop t0 40%by 2030 to meet climate targets but instead rose fractionally t0 59%in 2017.World leaders'warm words on renewables and energy efficiency needed to be matched with action,Birol said,urging govemments to create less investment uncertainty for green energy.Globally,energy investment fell 2%to$1.8tn in 2017,with electricity taking a bigger share than oil and gas for the second year in a row.The decline in renewable power generation spending was mostly down to falls in wind power and hydro but solar hit record levels despite becoming cheaper to install.While coal investment fell to its lowest level in 10 years,spending on gas-fired power stations rose 40%.Nuclear power fell sharply to the lowest level of investment in five years.In the oil and gas industry,rising prices have helped investment in production rise 4%last year and is expected to grow 5%this year.The US's shale boom will drive much of the groivth,and frackers are on track to achieve positive free cashflow this year,for the first time.The US is not expected to pump enough extra crude to bring down oil prices,though.Birol said"Us shale growth is very welcome growth for badly needed additions but this growth alone will not be enough to balance out the markets.Outside the US,investment in conventional oil and gas projects remains subdued and Birol said the world faced"major difficulties"if investment was not stepped u Motorists spent S 43bn on fully electric cars and plug-in hybrids last year,accounting for half of global growth in car sales.However,the battery-powered cars are not seriously denting oil demand yet the IEA said Governments are increasing investment in energy markets,either directly through state-owned firms or indirectly via investments policies and regulation,which Birol said was a surprising development
Which of the following statement can be inferred from Paragraph 2?A.Decline of the investment in green energy will hinder global climate goals
B.The investment in clean energy has dropped dramatically since 2014
C.Fossil fuels continue to account for the majority of increased energy
D.The investment in oil and gas will remain on a decreasing trend by 2030
考题
The world's energy watchdog has sounded the alarm over a"worrying"pause in the shift to clean energy after global investment in renewables fell 7%to$318bn（~240bn）last year.The International Energy Agency said the decline is set to continue int0 2018,threatening energy security,climate change and air pollution goals.Fossil fuels increased their share of energy supply investment for the first time since 2014,to$790bn,and will play a significant role for years on current trends,the IEA said.Investment in coal power dropped sharply but was offset by an uptick in oil and gas spending,the World Energy Investment repoit found..Dr Fatih Birol,the executive director of the IEA,said of the renewables fall:"We are seeing a decrease,which is disappointing.And more disappointing is we see the signs this decline may continue this year-this is a worrying trend."Fossil fuels'share of energy investment needs to drop t0 40%by 2030 to meet climate targets but instead rose fractionally t0 59%in 2017.World leaders'warm words on renewables and energy efficiency needed to be matched with action,Birol said,urging govemments to create less investment uncertainty for green energy.Globally,energy investment fell 2%to$1.8tn in 2017,with electricity taking a bigger share than oil and gas for the second year in a row.The decline in renewable power generation spending was mostly down to falls in wind power and hydro but solar hit record levels despite becoming cheaper to install.While coal investment fell to its lowest level in 10 years,spending on gas-fired power stations rose 40%.Nuclear power fell sharply to the lowest level of investment in five years.In the oil and gas industry,rising prices have helped investment in production rise 4%last year and is expected to grow 5%this year.The US's shale boom will drive much of the groivth,and frackers are on track to achieve positive free cashflow this year,for the first time.The US is not expected to pump enough extra crude to bring down oil prices,though.Birol said"Us shale growth is very welcome growth for badly needed additions but this growth alone will not be enough to balance out the markets.Outside the US,investment in conventional oil and gas projects remains subdued and Birol said the world faced"major difficulties"if investment was not stepped u Motorists spent S 43bn on fully electric cars and plug-in hybrids last year,accounting for half of global growth in car sales.However,the battery-powered cars are not seriously denting oil demand yet the IEA said Governments are increasing investment in energy markets,either directly through state-owned firms or indirectly via investments policies and regulation,which Birol said was a surprising development
What is the main reason for the falling investment in the renewable power generation?A.The complicated investment procedures
B.The drop in the demand of the green en
C.The decline in wind power and hydro
D.The lack of financial support and channels
考题
The world's energy watchdog has sounded the alarm over a"worrying"pause in the shift to clean energy after global investment in renewables fell 7%to$318bn（~240bn）last year.The International Energy Agency said the decline is set to continue int0 2018,threatening energy security,climate change and air pollution goals.Fossil fuels increased their share of energy supply investment for the first time since 2014,to$790bn,and will play a significant role for years on current trends,the IEA said.Investment in coal power dropped sharply but was offset by an uptick in oil and gas spending,the World Energy Investment repoit found..Dr Fatih Birol,the executive director of the IEA,said of the renewables fall:"We are seeing a decrease,which is disappointing.And more disappointing is we see the signs this decline may continue this year-this is a worrying trend."Fossil fuels'share of energy investment needs to drop t0 40%by 2030 to meet climate targets but instead rose fractionally t0 59%in 2017.World leaders'warm words on renewables and energy efficiency needed to be matched with action,Birol said,urging govemments to create less investment uncertainty for green energy.Globally,energy investment fell 2%to$1.8tn in 2017,with electricity taking a bigger share than oil and gas for the second year in a row.The decline in renewable power generation spending was mostly down to falls in wind power and hydro but solar hit record levels despite becoming cheaper to install.While coal investment fell to its lowest level in 10 years,spending on gas-fired power stations rose 40%.Nuclear power fell sharply to the lowest level of investment in five years.In the oil and gas industry,rising prices have helped investment in production rise 4%last year and is expected to grow 5%this year.The US's shale boom will drive much of the groivth,and frackers are on track to achieve positive free cashflow this year,for the first time.The US is not expected to pump enough extra crude to bring down oil prices,though.Birol said"Us shale growth is very welcome growth for badly needed additions but this growth alone will not be enough to balance out the markets.Outside the US,investment in conventional oil and gas projects remains subdued and Birol said the world faced"major difficulties"if investment was not stepped u Motorists spent S 43bn on fully electric cars and plug-in hybrids last year,accounting for half of global growth in car sales.However,the battery-powered cars are not seriously denting oil demand yet the IEA said Governments are increasing investment in energy markets,either directly through state-owned firms or indirectly via investments policies and regulation,which Birol said was a surprising development
What is the passage mainly about?A.More countries are shifting away from non-renewable energy
B.The fall in global investment for renewables is a worrying trend
C.The leaders should take action to address the investment uncertainty.
D.The renewable energy should take a bigger share in the market
考题
The world's energy watchdog has sounded the alarm over a"worrying"pause in the shift to clean energy after global investment in renewables fell 7%to$318bn（~240bn）last year.The International Energy Agency said the decline is set to continue int0 2018,threatening energy security,climate change and air pollution goals.Fossil fuels increased their share of energy supply investment for the first time since 2014,to$790bn,and will play a significant role for years on current trends,the IEA said.Investment in coal power dropped sharply but was offset by an uptick in oil and gas spending,the World Energy Investment repoit found..Dr Fatih Birol,the executive director of the IEA,said of the renewables fall:"We are seeing a decrease,which is disappointing.And more disappointing is we see the signs this decline may continue this year-this is a worrying trend."Fossil fuels'share of energy investment needs to drop t0 40%by 2030 to meet climate targets but instead rose fractionally t0 59%in 2017.World leaders'warm words on renewables and energy efficiency needed to be matched with action,Birol said,urging govemments to create less investment uncertainty for green energy.Globally,energy investment fell 2%to$1.8tn in 2017,with electricity taking a bigger share than oil and gas for the second year in a row.The decline in renewable power generation spending was mostly down to falls in wind power and hydro but solar hit record levels despite becoming cheaper to install.While coal investment fell to its lowest level in 10 years,spending on gas-fired power stations rose 40%.Nuclear power fell sharply to the lowest level of investment in five years.In the oil and gas industry,rising prices have helped investment in production rise 4%last year and is expected to grow 5%this year.The US's shale boom will drive much of the groivth,and frackers are on track to achieve positive free cashflow this year,for the first time.The US is not expected to pump enough extra crude to bring down oil prices,though.Birol said"Us shale growth is very welcome growth for badly needed additions but this growth alone will not be enough to balance out the markets.Outside the US,investment in conventional oil and gas projects remains subdued and Birol said the world faced"major difficulties"if investment was not stepped u Motorists spent S 43bn on fully electric cars and plug-in hybrids last year,accounting for half of global growth in car sales.However,the battery-powered cars are not seriously denting oil demand yet the IEA said Governments are increasing investment in energy markets,either directly through state-owned firms or indirectly via investments policies and regulation,which Birol said was a surprising development
The emerging worry about energy is thatA.the current short supply of the clean energy worldwide
B.the failure to transition to renewable energy sources,
C.the decrease of the investment to the energy exploitation
D.people's consciousness of environmental protection
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共用题干
Natural Gas1 Natural gas is produced from reservoirs deep beneath the earth's surface. It is a fossil fuel（矿物燃 料）,meaning that it is derived from orgaiiic material buried in the earth millions of years ago.The main corn- ponent of natural gas is methane（甲烷）.2 The popularity and use of clean natural gas have increased dramatically over the past 50 years as pipeline infrastructure（基础设施）has been installed to deliver it conveniently and economically to millions of residential,commercial and industrial customers worldwide.Today,natural gas service is available in all 50 states in the U.S.,and is the leading energy choice for fueling American homes and industries.More than 65 million American homes use natural gas.In fact,natural gas is the most economical source for home energyneeds,costing one-third as much as electricity.In addition to heating homes,much of the gas used in the United States is used as a raw material to manufacture a wide variety of products,from paint,to fibers for clothing,to plastics for healthcare,computing and furnishings.Natural gas is also used in a significant number of new electricity-generating power plants.3 Natural gas is one of the safest and cleanest fuels available. It emits（发出）less pollution than other fossil fuel sources. When natural gas is burned , it produces mostly carbon dioxide（二氧化碳）and water va- por一the same substances emitted when humans breathe.Compared with some other fossil fuels,natural gas emits the least amount of carbon dioxide into the air when combusted（燃烧）一making natural gas the clea-nest burning fossil fuel of all.4 The United States consumes about one一third of the world's natural gas output,making it the largest gas-consuming region in the world.The U.S.Department of Energy Information Administration forecasts that natural gas demand will grow by more than 50 percent by 2025.5 There are huge reserves of natural gas beneath the earth's surface.The largest reserves of natural gas can be found in Russia , West and North Africa and the Middle East. LNG（液化天然气）has been pro- duced domestically and imported in the United States for more than four decades.Today,the leading import- ers of LNG are Japan,Korea,France and Spain.Paragraph 3__________A:Popularity and Use of Natural GasB:Natural Gas Reserves and SupplyC:Natural Gas PricesD:Clean Fuel of ChoiceE:Disadvantages of Natural GasF:Natural Gas Consumption
考题
Air Bus’ world-renowned hot-section engineering______the needs of industrial gas turbine customers.A.replies
B.answers
C.frees
D.addresses
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第二篇Home HeatingCentral heating became popular only after the Civil War.Typically,coal-burning furnaces（火炉）fueled the early systems.Natural gas had developed into the leading fuel by 1960.Its acceptance resulted in part from its wide uses.Because it comes primarily from U.S.and Canadian fields , natural gas is also less vulnerable（脆弱的）than oil is to war.Oil remains the most important fuel in a few areas,such as New England.Electric heating dominates most areas with mild winters and cheap electricity,including the South and the Northwest.It was made popular at least in the South by the low cost of adding electric heating to new houses built with air-conditioning.Bottled gas,which is somewhat more expensive than utility gas,is the fuel of choice in rural areas not served by utility pipelines.Wood is the leading heating fuel in just a few rural counties.Home heating,which accounts for less than 7 per cent of all energy consumed in the U.S.,has had a commendable（值得赞扬的）efficiency record : from 1 978 to 1 997 , the amount of fuel consumed for this purpose declined 44 per cent despite a 33 per cent increase in the number of housing units and an increase in house size.TheU.S.Department of Energy,however,forecasts that energy used in home heating will rise by 14 per cent over the next two decades.That rise is small considering an expected 21 per cent increase in the number of houses and the trend toward larger houses.Natural gas and electricity will probably dominate the home heating market for the next two decades.Solar（太阳的）heating never became popular because of cost and limited winter sunlight in most areas;in 2000 only 47,000 homes relied on it.According to paragraph 3,energy consumed in home heating over the next two decades will increase byA:33 per cent.B:31 per cent.C:21 per cent.D:14 per cent.
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第二篇Home HeatingCentral heating became popular only after the Civil War.Typically,coal-burning furnaces（火炉）fueled the early systems.Natural gas had developed into the leading fuel by 1960.Its acceptance resulted in part from its wide uses.Because it comes primarily from U.S.and Canadian fields , natural gas is also less vulnerable（脆弱的）than oil is to war.Oil remains the most important fuel in a few areas,such as New England.Electric heating dominates most areas with mild winters and cheap electricity,including the South and the Northwest.It was made popular at least in the South by the low cost of adding electric heating to new houses built with air-conditioning.Bottled gas,which is somewhat more expensive than utility gas,is the fuel of choice in rural areas not served by utility pipelines.Wood is the leading heating fuel in just a few rural counties.Home heating,which accounts for less than 7 per cent of all energy consumed in the U.S.,has had a commendable（值得赞扬的）efficiency record : from 1 978 to 1 997 , the amount of fuel consumed for this purpose declined 44 per cent despite a 33 per cent increase in the number of housing units and an increase in house size.TheU.S.Department of Energy,however,forecasts that energy used in home heating will rise by 14 per cent over the next two decades.That rise is small considering an expected 21 per cent increase in the number of houses and the trend toward larger houses.Natural gas and electricity will probably dominate the home heating market for the next two decades.Solar（太阳的）heating never became popular because of cost and limited winter sunlight in most areas;in 2000 only 47,000 homes relied on it.What fuel is the dominant fuel in New England?A:Gas.B:Electricity.C:Wood.D:Oil.
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第二篇Home HeatingCentral heating became popular only after the Civil War.Typically,coal-burning furnaces（火炉）fueled the early systems.Natural gas had developed into the leading fuel by 1960.Its acceptance resulted in part from its wide uses.Because it comes primarily from U.S.and Canadian fields , natural gas is also less vulnerable（脆弱的）than oil is to war.Oil remains the most important fuel in a few areas,such as New England.Electric heating dominates most areas with mild winters and cheap electricity,including the South and the Northwest.It was made popular at least in the South by the low cost of adding electric heating to new houses built with air-conditioning.Bottled gas,which is somewhat more expensive than utility gas,is the fuel of choice in rural areas not served by utility pipelines.Wood is the leading heating fuel in just a few rural counties.Home heating,which accounts for less than 7 per cent of all energy consumed in the U.S.,has had a commendable（值得赞扬的）efficiency record : from 1 978 to 1 997 , the amount of fuel consumed for this purpose declined 44 per cent despite a 33 per cent increase in the number of housing units and an increase in house size.TheU.S.Department of Energy,however,forecasts that energy used in home heating will rise by 14 per cent over the next two decades.That rise is small considering an expected 21 per cent increase in the number of houses and the trend toward larger houses.Natural gas and electricity will probably dominate the home heating market for the next two decades.Solar（太阳的）heating never became popular because of cost and limited winter sunlight in most areas;in 2000 only 47,000 homes relied on it.Which of the following statements is NOT true,according to the article?A:Natural gas comes partly from Canadian fields.B:Bottled gas is more expensive than utility gas.C:Equipment for home heating has been considerably improved.D:Solar heating dominated America in 2000.
考题
单选题The hot expanding gas rotates the blades of the exhaust turbine, thus giving out large part of its power, which drives （）.A
the oil separatorB
the fresh water generatorC
the compressorD
fire pump
考题
单选题What is an advantage of diesel over steam turbine propulsion? （）A
Less fuel consumption per SHPB
Diesel fuel costs less than bunker C or its equivalentC
Less routine maintenance requiredD
Less weight per SHP
考题
单选题A refrigeration unit will tend to short cycle when operating （）.A
under heavy loadsB
during hot gas defrostC
under light loadsD
during starting conditions
考题
单选题Why will a turbocharger diesel engine produce black smoke if excessive additional load is applied too quickly?（）A
Exhaust energy would draw excess airB
The inertia of the turbocharger rotor causes a time lag which delays the turbocharger speed increaseC
Exhaust gas pumping losses are increased due to turbine windageD
Exhaust gas back pressure falls slightly due to increased nozzle action
考题
单选题Gas turbines differ from steam turbines in that （）.A
steam rather than gas is used to turn a shaftB
vapor rather than gas is used to turn a shaftC
the former uses gas to turn a shaftD
the latter uses gas to turn a shaft
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