单项选择题
A （）is used for lifting long heavy cargo.
A.derrick
B.crane
C.jumbo boom
D.boom
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相关考题
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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 -
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 -
单项选择题
At the （）port, tankers pump the oil ashore using her own pumps.
A.discharging
B.load
C.loading
D.charging
