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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

Head tank should be used to remove （） from cooling water.

A.scale
B.sludge
C.chemicals
D.air

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