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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(轮机专业) > 轮机英语 > 船舶电气与船舶安全

单项选择题

（） can be operated independently or locked together and operated as a twin-job cranes of double capacity.

A.Two derricks
B.A derrick and a crane
C.Two cranes
D.A crane and a winch

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Some cranes are mounted in pairs on a common platform which can be rotated through（）.

A.360°
B.270°
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Deck cranes require（） time to prepare for working cargo than derricks.

A.less
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The duty of a deck winch is to lift and lower a load by means of a fixed rope on （）.

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