网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
Seamless mild steel is used for steam (also copper for moderate pressure and temperature), h-pair, feed discharge and all oil fuel pressure pipingsAccording to the above sentence, which of the following statements is not true?（）
A
Both seamless mild steel and copper may be used for middle pressure steam
B
hpair means high pressure air
C
The feed piping of the boilers can be made of seamless mild steel
D
All oil pipings are made of mild steel
参考答案
参考解析
解析：
暂无解析
更多 “单选题Seamless mild steel is used for steam (also copper for moderate pressure and temperature), h-pair, feed discharge and all oil fuel pressure pipingsAccording to the above sentence, which of the following statements is not true?（）A Both seamless mild steel and copper may be used for middle pressure steamB hpair means high pressure airC The feed piping of the boilers can be made of seamless mild steelD All oil pipings are made of mild steel” 相关考题
考题
______ is not usually used in liquid cargo systems．A.Hydraulic drive systemsB.Electric drive systemsC.Steam drive systemsD.Man-powered drive systems
考题
What material is allowed in construction of the hull of a vessel with an integral diesel fuel tank ________．A.Steel or aluminumB.Sandwich style fibreglass with a natural rubber coreC.Copper-nickel or copper silicon alloysD.Any or all of the above
考题
A half-height container is used ______.A.to carry cargos of low densityB.when stowage space is limitedC.to carry cargos such as steel products or drumsD.to double the stowage capacity of the vessel
考题
Most propellers on merchant vessels are constructed of______．A.manganese bronzeB.cast ironC.mild steelD.improved plow steel
考题
Geothermal(地热)Energy
1 Since heat naturally moves from hotter regions to cooler ones, the heat from the earth's center flows outwards towards the surface. In this way, it transfers to the next layer of rock. If the temperature is high enough, some of this rock melts and forms magma(岩浆). The magma ascends in its turn towards the earth's surface. It often remains well below the earth's surface, creating vast areas of hot rock. In such regions, there are deep cracks, which allow rainwater to descend underground. Some of the heated rainwater travels back up to the earth's surface where it will appear as a hot spring. However, if this ascending hot water reaches a layer of impermeable(不可渗透的)rock, it remains trapped, forming a geothermal reservoir. If geothermal reservoirs are close enough to the surface, they can be reached by drilling wells. Hot water and steam shoot up the wells naturally, and can be used to produce electricity in geothermal power plants.
2.A few geothermal power plants depend on dry-stem reservoirs which produce steam but little or no water. In these cases, the steam is piped up directly to provide the power to spin a turbine generator. The first geothermal power plant, constructed at Lardarello in Italy, was of this type, and is still producing electricity today.
3.Most currently operating geothermal power plants are either "flash" steam plants or binary(双重的)plants. Flash plants produce mainly hot water ranging in temperature from 300° to 700°Fahrenheit. This water is passed through one or two separators where released from the pressure of the underground reservoir, it "flashes" or boils into steam Again, the force of this steam provides the energy to spin the turbine and produce electricity. The geothermal water and steam are then reinjected directly back down into the earth to maintain the volume and pressure of the reservoir. Gradually they will be reheated and can then be used again.
4.A reservoir with temperatures below 300° Fahrenheit is not hot enough to flash steam but it can still be used to generate electricity in binary fluid. The steam from this is used to power the turbines. As in the flash steam plant, the geothermal water is recycled back into the reservoir.
文章(23~30)
Paragraph1_____A.Dry steam plants
B.Binary plants
C.Origin of geothermal energy
D.Generation of electricity
E.Flash steam plants
F.Recyclable water and steam
考题
The varnish is used to paint the （）(木制品) and deck rail.A、woodworkB、teamworkC、cargo workD、steel work
考题
The "1000" in 1000BaseT cabling represents which of the following?（）A、The theoretical maximum cable lengthB、The theoretical maximum bandwidthC、The theoretical port limit of the cableD、The quality level of the copper wiring used
考题
单选题A half-height container is used（）.A
to carry cargoes of low densityB
when stowage space is limitedC
to carry cargoes such as steel products or drumsD
to double the stowage capacity of the vessel
考题
单选题The steam boiler is part of a closed loop steam, whereby, after the energy of the steam is used up and it becomes water again, （） is collected and returned back to the boiler for heating up again to steam.A
the formerB
the firstC
the latterD
the last
考题
单选题A gypsy or gypsyhead is a（）.A
punt used for painting over the sideB
small, reciprocating steam engineC
spool-shaped drum fitted on a winchD
swinging derrick
考题
单选题The "1000" in 1000BaseT cabling represents which of the following?（）A
The theoretical maximum cable lengthB
The theoretical maximum bandwidthC
The theoretical port limit of the cableD
The quality level of the copper wiring used
考题
单选题A heavy steel device that is set on the sea floor and used as a drilling template in offshore drilling operations is called a（）.A
temporary guide baseB
permanent guide baseC
guide frameD
foundation template
考题
单选题When a sudden increase in steam demand comes to normal, the drum pressure will and water level in the drum will（）.A
rise, rise alsoB
rise, dropC
drop, riseD
drop, drop also
考题
单选题（） are two vertical supports，usually steel，one each side of the centerline of the ship used to support booms.A
ShroudsB
King postsC
StaysD
Turnbuckles
考题
单选题Too much excess air is （）because the heat generated is being lost through the exhaust trunking instead of being made used of in heating the water to produce steam.A
not goodB
goodC
betterD
the best
考题
单选题Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）A
double bottom fuel oil tank temperatureB
heater supply steam flowC
pressure of the fuel supplied to the burnersD
attemperator steam flow in the heater discharge circuit
考题
单选题A fid is a（）.A
mallet used when splicing wire ropeB
sharp pointed crow bar used to unlay wire ropeC
tapered steel pin used to separate wire ropeD
tapered wooden pin used when splicing heavy rope
考题
填空题In warm and mild regions, farmed fish and shellfish are also affected by POPs because they are fed fish meal.____
考题
单选题To clean a dirty fiber towing hawser used in ocean towing，you should（）.A
use lye or other mild detergentB
wash it with fresh water，dry and store itC
wash it with salt waterD
use cleaning fluid on nylon，dacron and other synthetic lines
考题
单选题After more than one hundred years of steel production at Hallside, ______.A
the land could not be used for anything.B
it was impossible to use the land to build on.C
the land could then be built on.D
the land could be used for any purpose.
考题
单选题The main bearing shells are made of steel with a lining of bearing metal which may be white metal, copper-lead or aluminum-tin alloy What is the meaning of “which” in the sentence above?（）A
main bearing shellsB
main bearingC
steelD
bearing metal
考题
单选题Copper is often used as an electrical conductor because it （）.A
has high resistance at low temperaturesB
has a highly polished surfaceC
is able to pass current with little oppositionD
holds insulation together well
考题
单选题Cast iron and gunmetal fittings are used freely in small sizes at moderate pressure; large fittings, those for high pressure and temperature are cast or mild steelIn the above sentence, the word “those” means （）.A
east iron firingsB
mild steel fittingsC
small fittingsD
large fittings
考题
单选题Soot blowers should be used in proper sequence so that（）A
excess stresses will not be set up in the boilerB
the decks will not be covered with sootC
the soot will be swept toward the uptakesD
there will not be a loss of steam pressure
考题
单选题The steam coils in a high pressure evaporator used for saltwater service should be de-scaled with （）.A
a needle gunB
soap and waterC
a wire brushD
a chipping hammer
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
热门标签
最新试卷
