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單項選擇題

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

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

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單項選擇題

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

單項選擇題

During repair,lubrication lines and orifices must be （）.

A.taken away
B.engaged
C.connected
D.sealed off