单项选择题

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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单项选择题
During repair,lubrication lines and orifices must be （）.

A.taken away
B.engaged
C.connected
D.sealed off
单项选择题
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
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