Relative humidity is the percentage of water vapor that is in the air as compared to the maximum amount it can hold at（）.<br>A:a specific barometric pressure<br>B:a specific temperature<br>C:a specific wind speed<br>D:any time

Relative humidity is the percentage of water vapor that is in the air as compared to the maximum amount it can hold at（）.
A:a specific barometric pressure
B:a specific temperature
C:a specific wind speed
D:any time

出自：海船船员证

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