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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

The period of valve overlap is when （）.

A.the inlet valve is open
B.the exhaust valve is open
C.both valves are close
D.both valves are open

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