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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

Each cylinder is closed at the top by a （）, made of a special heat-resistant steel.

A.cylinder liner
B.coupling flange
C.cylinder cover
D.piston crown

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Each cylinder has one starting valve which is usually opened by air pressure and closed by （）

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