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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(驾驶专业) > 航海英语 > 航海英语综合练习

单项选择题

Which instrument is used to measure the relative humidity of air?（）

A.Hydrometer
B.Hygrometer
C.Spectrometer
D.Barometer

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