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單項(xiàng)選擇題

The running wheel runs along （）on top of the hatch coaming.

A. the guide rail
B. the guide rope
C. the side coaming
D. the guide roller

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單項(xiàng)選擇題

Could you show me （）to open the hatch covers?

A.why
B.when
C.how
D.what

單項(xiàng)選擇題

If the hatch cover does not move, （）should be checked.

A. the open valve
B. the stop valve
C. the steam valve
D. the close valve