单项选择题
Containers are loaded and discharged by（）.
A. heavy derrick
B. special cranes
C. fork trucks
D. winch
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单项选择题
（）cargo must be kept away from dry cargo.
A.Wet
B.Heavy
C.Light
D.Dry -
单项选择题
（）cargo is unloaded by large grain elevators.
A.General
B.Liquid
C.Drybulk
D.Wet -
单项选择题
Rice is usually in （）.
A.drums
B.cases
C.bags
D.tanks
