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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 > 船舶电气与船舶安全

单项选择题

A simple pumping system consists of a suction branch, a pump and （）.

A.a priming device
B.a discharge branch
C.a filter
D.a suction valve

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