單項選擇題

A （）is used for lifting long heavy cargo.

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

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單項選擇題

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

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

單項選擇題

At the discharging port, tankers pump the oil ashore using （）.

A. shore pumps
B. her own pumps
C. large pumps
D. large tubes