问题
单项选择题
Which instrument is used to measure the relative humidity of air?（）
A.Hydrometer
B.Hygrometer
C.Spectrometer
D.Barometer
答案
参考答案：B
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Which instrument is used to measure the relative humidity of air?（）
A.Hydrometer
B.Hygrometer
C.Spectrometer
D.Barometer
参考答案：B