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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 position of the piston parts in relation to each other is secured by means of （） in the crown.

A.a mark
B.a bolt
C.a dowel pin
D.a measuring tool

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