單項(xiàng)選擇題

Sailors should know the （）(安全工作負(fù)荷量)of derricks.

A. safe working load
B. safety work load
C. safe work load
D. safe working loading

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單項(xiàng)選擇題

Liquid bulk cargo is loaded and discharged by （）(泵).

A.pipes
B.tubes
C.buckets
D.pumps

單項(xiàng)選擇題

（）(濕貨)must be kept away from dry cargo.

A. Light cargo
B. Wet cargo
C. Heavy cargo
D. Deck cargo