单项选择题
The jumbo boom can （）.
A. lift heavy cargo
B. load and unload
C. join ropes together
D. lift light cargo
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A.greasing
B.greaseing
C.greased
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Containers are loaded and discharged by（）.
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（）cargo must be kept away from dry cargo.
A.Wet
B.Heavy
C.Light
D.Dry
