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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 lower end of each piston rod is reduced in diameter to fit a bore in （）.

A.the crosshead
B.the journals of the crosshead
C.the crosshead shoes
D.the guides

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