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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

Diesel oil may be used to cool （） of a diesel engine.

A.cylinders
B.exhaust valves
C.pistons
D.fuel valves

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