单项选择题

This is deck cargo. （）stow it in the holds.

A.Not
B.Notto
C.Don’t
D.Can

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单项选择题

Before leaving the harbour, all derricks must be （）properly.

A.tightened
B.secured
C.unfastened
D.loaded

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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