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單項(xiàng)選擇題

Before opening the hatch covers, all cleats are to be （）.

A. released
B. secured
C. taken away
D. sent out

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單項(xiàng)選擇題

A （）is used for lifting long heavy cargo.

A.derrick
B.crane
C.jumbo boom
D.boom

單項(xiàng)選擇題

（）cargo is unloaded by huge grabs on cranes or by large grain elevators.

A. Dry
B. Dry general
C. Dry bulk
D. Liquid

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