單項(xiàng)選擇題

（）, the following possible causes should be investigated.

A.Should the engine stop without apparent reason
B.The engine should stop without apparent reason
C.The engine stops without apparent reason
D.The engine is stopped without apparent reason

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單項(xiàng)選擇題

We have planned to remove the piston with the help of assistant engineers during the cargo unloading, while the vessel （）port Shanghai.

A.reaches to
B.gets
C.calls on
D.calls at

單項(xiàng)選擇題

（）does it take to change the main engine from ahead to astern?

A.How many times
B.How much water
C.How long
D.How length