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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

In an ordinary four-stroke engine the exhaust valves open （）

A.after TDC
B.before TDC
C.after BDC
D.before BDC

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