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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

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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

單項(xiàng)選擇題

To ensure the safety in operating hatch covers, oil the moving parts （）.

A. monthly
B. every three months
C. once monthly
D. every two months