单项选择题
A. released B. secured C. taken away D. sent out
A （）is used for lifting long heavy cargo.A.derrickB.cra...
单项选择题A （）is used for lifting long heavy cargo.
A.derrick B.crane C.jumbo boom D.boom
（）cargo is unloaded by huge grabs on cranes or by large...
单项选择题（）cargo is unloaded by huge grabs on cranes or by large grain elevators.
A. Dry B. Dry general C. Dry bulk D. Liquid
At the discharging port, tankers pump the oil ashore us...
单项选择题At the discharging port, tankers pump the oil ashore using （）.
A. shore pumps B. her own pumps C. large pumps D. large tubes
