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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

Hydrocarbon vapors are usually detected by the use of the （）.

A.flame safety lamp
B.combustible gas indicator
C.gasometer
D.oxygen indicator

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