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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

Among the rings of a piston the （） one is subjected to the greatest load and temperature.

A.bottom
B.middle
C.top
D.none of the above

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