单项选择题
Sailors should know the （）(安全工作负荷量)of derricks.
A. safe working load
B. safety work load
C. safe work load
D. safe working loading
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Liquid bulk cargo is loaded and discharged by （）(泵).
A.pipes
B.tubes
C.buckets
D.pumps -
单项选择题
（）(湿货)must be kept away from dry cargo.
A. Light cargo
B. Wet cargo
C. Heavy cargo
D. Deck cargo -
单项选择题
This is （）(甲板货).
A. deck cargo
B. wet cargo
C. light cargo
D. heavy cargo
