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單項(xiàng)選擇題

（） may have two emergency source of power, thus requiring two emergency switchboards.

A.Large passenger vessels
B.General cargo ships
C.Container ships
D.Oil tankers

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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

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

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