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單項(xiàng)選擇題

During working, when the piston is near the （）, the air ignites the fine spray of fuel.

A.TDC
B.DTC
C.BDC
D.BCD

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單項(xiàng)選擇題

During the suction stroke, the piston is moving （）.

A.inwards
B.outwards
C.downwards
D.upwards

單項(xiàng)選擇題

During the inspection, the starting air valves should be closed （） the engine from turning.

A.to increase
B.to speed up
C.to prevent
D.to reduce

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