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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 not be （）.

A.low compression
B.failure of the fuel pump to discharge fuel
C.incorrect timing of fuel pump
D.turning gear being still on

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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

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

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