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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 starting air system usually has （） to prevent starting if anything is not in order.

A.drain cocks
B.vent valves
C.counteracts
D.interlocks

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