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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

For a main diesel engine the lube oil in the bearings is drawn from （）, usually located in the bedplate.

A.a gravity tank
B.a sump
C.a vessel
D.a bottle

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