单项选择题

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

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

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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

单项选择题

Due to （） action of pistons some relative motion between parts in contact in the coolant supply and return system must occur.

A.reciprocating
B.rotating
C.running
D.removing

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