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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

In a diesel engine lube oil system, which of the following parts should be lubricated first?（）

A.Camshaft beatings
B.Main bearings
C.Piston crowns
D.Cylinder walls

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