单项选择题

A.tightenedB.securedC.unfastenedD.loadedBefore leaving ……

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

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

<上一题目录下一题>

热门试题

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

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

单项选择题（）on cargo lights.

A.Close
B.Switch
C.Open
D.All above.

单项选择题These goods shall be handled with （）.

A.caution
B.poisonous
C.flammable
D.dangerous