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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 cast iron guide-ways for （） are attached to the top section and seal off the crankcase.

A.the connecting rod
B.the cross-head
C.the piston rod
D.the air box

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