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單項(xiàng)選擇題

If the engine does start on air, but combustion does not immediately begin, the cause may be （）.

A.failure of the fuel pumps
B.starting air pressure too low
C.stop valve in air line closed
D.the turning gear still engaged

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單項(xiàng)選擇題

If the engine does not start on air, it may be due to （）

A.low compression of the fuel pumps
B.incorrect timing of fuel pumps
C.the starting air valves stuck
D.air-locks in fuel oil pipeline

單項(xiàng)選擇題

If the engine （） for a long period, there will be a danger of frost.

A.must to stand inoperative
B.has to stand inoperative
C.must be stood idle
D.will stand idle

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