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單項(xiàng)選擇題

（） usually helps to induce air movement to assist combustion.

A.Cylinder cover
B.Main bearing
C.The exhaust valve
D.The piston movement

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單項(xiàng)選擇題

（） is secured by means of side-chock bolts and end-chock bolts.

A.The bedplate
B.The column
C.The main bearing
D.The double bottom

單項(xiàng)選擇題

（） in what position the engine stops there will always be at least one of the cylinders with its starting air valve open to admit compressed air to start the engine.

A.Because
B.Owing to
C.For
D.No matter

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