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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

Bearing knocks are likely to occur from （）.

A.less clearance
B.dirty lube oil
C.overload
D.bearing wear

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