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單項(xiàng)選擇題

All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner during （） for new piston rings.

A.the running-in period
B.the running process
C.gas exchange process
D.the boiler firing

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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

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

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