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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单项选择题

A.pipes
B.tubes
C.buckets
D.pumps

单项选择题

A. Light cargo
B. Wet cargo
C. Heavy cargo
D. Deck cargo

单项选择题

A. deck cargo
B. wet cargo
C. light cargo
D. heavy cargo