单项选择题

The standard size of the containers is （）high.

A.9ft
B.8ft
C.8m
D.9m

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

A.Not
B.Notto
C.Don’t
D.Can
单项选择题
Before leaving the harbour, all derricks must be （）properly.

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