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

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

出自：海船船员证

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