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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 projection on a shaft designed to change circular motion into up and down or back and fore motion is called （）.

A.wheel
B.crankshaft
C.running gear
D.cam

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