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單項(xiàng)選擇題

Air cocks, usually positioned at the （） in a circulating system, is used to get rid of the air in the system.

A.bending joint
B.expansion tank
C.weld
D.the highest point

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單項(xiàng)選擇題

After the order “（）” is given, the air system is shut down, the turning gear put in.

A.Finished with Engine
B.Stop the Engine
C.Stand-by Engine
D.Slow-down Engine

單項(xiàng)選擇題

After the engine is warned, we should（） the turning gear before starting up the engine.

A.take in
B.put in
C.take out
D.put up

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