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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 crank chamber oil （）.

A.can be recovered
B.is only supplied to cylinders
C.only feeds the main bearing
D.is a kind of detergent

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