单选题The humidifier’s valve of air-conditioner should be （）, when the temperature is 5~8°C in the winter.AdecreasedBincreasedCfixedDclosed
单选题
The humidifier’s valve of air-conditioner should be （）, when the temperature is 5~8°C in the winter.
A
decreased
B
increased
C
fixed
D
closed
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