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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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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（）on cargo lights.
A.Close
B.Switch
C.Open
D.All above.
