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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 > 船舶动力装置

单项选择题

The crankshaft deflection is at first to be （） before and after repair.

A.disassembled
B.renewed
C.measured
D.regulated

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The crank-room cover should not be opened until at least （） minutes after the engine stops.

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