单项选择题

（）operation, any obstacles in the way of hatches must be removed and cleaned.

A.Before
B.During
C.After
D.Within

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单项选择题

Each （）consists of two or more panels.

A.cover
B.hatch
C.derrick
D.winch

单项选择题

Keep a close watch on（） cargo.

A.value
B.valuation
C.valuable
D.All above

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