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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

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單項選擇題

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

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

單項選擇題

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

A.overhaul
B.running
C.blowing down
D.All of the above are correct