單項選擇題

When the weather becomes bad, the hatch covers will be （）(關(guān)閉).

A. closed
B. opened
C. handled
D. opened and closed

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單項選擇題

Don’t operate two or more （）(艙蓋)at the same time.

A.caps
B.levers
C.hatch covers
D.hatches

單項選擇題

lead block（）

A.滑車
B.導(dǎo)向滑車
C.千斤索
D.底腳滑車