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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

Due to （） action of pistons some relative motion between parts in contact in the coolant supply and return system must occur.

A.reciprocating
B.rotating
C.running
D.removing

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