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单选题
The supercharger takes air out of the surrounding atmosphere and then feeds it to the engine’s （）.
A
inlet valves
B
exhaust valves
C
emergency valves
D
run-return valves
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考题
According to the passage, what is one disadvantage of skyscrapers that have mirroredwalls?__________A.The exterior surrounding air is heated
B.The building materials are very expensive
C.Construction time is increased
D.Extra air-conditioning equipment is needed
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单选题The supercharger takes air out of the surrounding atmosphere and then feeds it to the engine’s （）.A
inlet valvesB
exhaust valvesC
emergency valvesD
run-return valves
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单选题The starting of a marine diesel engine is generally carried out with the assistance of （）.A
compressed airB
electricityC
hydraulic oilD
compressing air
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单选题Gas masks（）.A
should be worn while fighting a fireB
can be used in atmosphere deficient in oxygenC
filter contaminants from air that is to be breathedD
may be substituted for a self-contained breathing apparatus
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单选题The power developed by a large slow-speed main propulsion diesel engine is dependent upon the （）A
quantity of air it takes in and retains in the cylinders during a given time periodB
proportion of trapped air that is utilized in the combustion processC
thermodynamic efficiency of the engine cycleD
all of the above
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单选题Clouds form（）.A
as a mass of warm，humid air rises into the atmosphere and cools，condensing moisture into small dropletsB
as winds blow across bodies of water，the sun causes the moisture to be absorbed and move upward forming cloudsC
dry air compresses moisture from the atmosphere into cloudsD
when the relative humidity of the atmosphere is low
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单选题Changing from solid to liquid, water takes in heat from all substances near it, and this _____ produces artificial cold surrounding it.A
absorptionB
transitionC
consumptionD
interaction
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单选题After passing through the turbine the exhaust gas is conducted out into the（）.A
intercoolerB
compressorC
cylinderD
open air
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单选题The moisture equilibrium chart can be used to determine the（）.A
Absolute moisture content of the air surrounding a hygroscopic cargo when moisture equilibrium existsB
Dew point temperature that the air surrounding a hygroscopic commodity will have when in moisture equilibrium with that commodityC
Enthalpy of the air surrounding a hydroscopic cargo which is in moisture equilibrium with the cargoD
Temperature at which moisture equilibrium will occur in a cargo hold containing a hygroscopic cargo
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单选题Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger?（）A
Reduce engine speed to idle before removing the filterB
Soak the dirty filter in kerosene onlyC
Blow out the air inlet with compressed airD
Cover the air inlet after removing the filter
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单选题According to the passage, the root cause for weather changes on the earth is ______.A
the atmosphere surrounding the earthB
water from oceans and lakesC
energy from the sunD
greenhouse gases in the sky
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问答题You are trying to fill a bath with both taps on, but have accidentally left out the plug. Normally the hot water tap takes 8 minutes to fill the bath and the cold water tap takes 10 minutes. However, the water empties out through the plug hole in 5 minutes. How long will it take for the bath to fill?
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