（） or air venting arrangement is fitted to the fuel supply passage.
A . An air pump
B . A compressor
C . A fuel pump
D . A priming
相似题目
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By far the greatest use is for diesel engine starting using air pressure of 25 bar or more provided by （）.
A、rotary compressors
B、reciprocating compressors
C、centrifugal compressors
D、screw compressors
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Regulations require that cargo tanks carrying grades D or E liquids on tank barges be vented with（）.
A . gooseneck vents and flame screens
B . pressure-vacuum relief valves
C . branch vent lines and a vent header
D . forced draft blower
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Diesel engines obtain combustion air through turbo chargers，blowers，or（）.
A . air starters
B . carburetors
C . natural aspiration
D . air receiver
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Starting air for auxiliary engines may be taken directly from the main reservoirs or through （）.
A . an auxiliary reservoir
B . a controlling air bottle
C . an emergency air compressor
D . a main air compressor
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A high temperature alarm or （） which will melt is used to guard against the explosion of compressor air pipelines.
A . a flame trap
B . a relief valve
C . a fusible plug
D . a bursting ca
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In extreme weather conditions, either hot or cold, control of the air conditioning plant presents （） difficulties.
A . few
B . little
C . a little
D . le
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When installed for bilge pumping or ballast duty, centrifugal pumps require a （） to remove air from the suction pipe.
A . air chamber
B . head lank
C . primer
D . prime mover
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Most air conditioning units have （） for adjusting the ratio of recirculated fresh airCare must be taken not to reduce the fresh air so that stuffiness or smells arise.
A . catch plates
B . dampers
C . regulating valves
D . fa
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When the dew point of the outside air is lower than or equal to the dew point of the air in the cargo hold，you should（）.
A . secure all ventilation
B . shut down the exhaust blowers
C . shut down the intake blowers
D . ventilate the cargo hold
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Temperature and moisture characteristics are modified in a warm or cold air mass due to （）.
A . pressure changes in the air mass
B . movement of the air mass
C . the heterogeneous nature of the air mass
D . upper level atmospheric change
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The air charge leaving an intercooler, or after-cooler of an air compressor can be expected to be （）.
A、superheated
B、super-cooled
C、at or below the dew point
D、All of the above
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Air circulation is caused or affected by（）.
A . the rotation of the earth on its axis
B . convection currents caused by differences in radiant heating between equatorial and polar regions
C . mountain ranges
D . All of the above
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The extended aeration process consists of （） the liquor either by bubbling air through it or by agitating the surface.
A . A.deoxygenating
B . B.oxygenating
C . C.chemicalizing
D . D.disinfecting
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A vessel emitting harmful substances into the air or spilling oil into the sea is a（）.
A . polluter
B . emitter
C . spiller
D . oiler
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Whilst the engine is turning, check to see that no water is leaking into the crankcase, scavenge air belt, or from （）.
A . exhaust valves
B . starting valves
C . fuel valves
D . the indicator cock
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Charging is the filling of the engine cylinder with a supply or charge of fresh air （） compression.
A . to need
B . ready for
C . want to
D . going to be
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A venetian vent or rice ventilator is used in stowage of which cargo?（）.
A . Bagged cargo
B . Bulk grain
C . Bulk rice
D . Refrigerated good
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____ no air or water, there would be no life in the world.
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11. A central heating and cooling produces warm or cool air in one central area anddistributes it throughout the building
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121.A vessel emitting harmful substances into the air or spilling oil into the sea is a( )。
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The lateral consonant /l/ is produced with potential air flow around one or both sides of the tongue.
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听力原文：W: Air pollution is one of the most serious problems in the world. Polluted air can make us sick or even kill us. Why isn't more done to stop it？
M: Everyone wants to stop it, but it is a difficult problem to solve. Meat pollution is mused by things people need.
W: What do you mean？
M: Well, automobiles and airplanes cause pollution but they also provide transportation.
W: Right. And factories cause air pollution but they provide people with jobs and products.
M: Cities are the worst offenders. In crowded cities, factories and cars can add tons of pollution to the air every day.
W: Yes. When I drove, to town yesterday, the clear air changed. It seemed like a dark cloud hung over the city.
M: Nobody likes air pollution. It smells bad; it makes it difficult to breathe.
W: True, it even damages the plants that provide tis with food. No wonder we get sick. It's dangerous to everyone's health.
M: I think everyone knows it is a serious problem. When air pollution can even damage strong materials like steel and concrete; think what it does to poor humans.
W: It is terrible, and yet we do need some things that cause it. We'll have to try to figure out a solution.
(20)
A．Most people don't think it is a serious problem.
B．Most of our pollution is caused by things people need.
C．The government has not spent enough money to stop it.
D．The seriousness of pollution has not been realized by the government.
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Which information must be contained in, or attached to, the dispatch release for a flag air carrier flight？
A、Type of operation(e.g., IFR,VFR),TRIP NUMBER.
B、Total fuel supply and minimum fuel required on board the airplane.
C、Passenger manifest, company or organization name, and cargo weight.
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You may get there by sea.You may go there by air.（用either...or...连接句子)
