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單項選擇題

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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單項選擇題

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

單項選擇題

If the atomizer holes are enlarged beyond the makers recommended size, the atomizer must be （）.

A.repaired
B.replaced
C.replenished
D.repeated

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