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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

After a ship enters service it is（） for the main bus-bar to be made dead.

A.usually
B.commonly
C.exceptional
D.unavoidably

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（） is a machine by which electrical energy is transformed into mechanical energy.

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