单项选择题

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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单项选择题
Could you show me （）to open the hatch covers?

A.why
B.when
C.how
D.what
单项选择题
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
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