單項選擇題

Containers are loaded and discharged by（）.

A. heavy derrick
B. special cranes
C. fork trucks
D. winch

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單項選擇題

（）cargo must be kept away from dry cargo.

A.Wet
B.Heavy
C.Light
D.Dry

單項選擇題

（）cargo is unloaded by large grain elevators.

A.General
B.Liquid
C.Drybulk
D.Wet