单项选择题
When starting air-conditioner in the winter, we should open（）in sequence. Ⅰ.alve of warming Ⅱ.alve of humidifier Ⅲ.an
A.Ⅲ-Ⅱ-Ⅰ B.Ⅲ-Ⅰ-Ⅱ C.Ⅰ-Ⅲ-Ⅱ D.Ⅱ-Ⅲ-Ⅰ
The air-conditioner is running in the winter and to be ...
单项选择题The air-conditioner is running in the winter and to be stopped, we should（）
A.close Fan and Humidifier at the same time B.firstly close Fan and then close humidifier immediately C.firstly close humidifier and then close Fan immediately D.firstly close humidifier and then close Fan after 30 seconds
The humidifier’s valve of air-condition should be （）, w...
单项选择题The humidifier’s valve of air-condition should be （）, when the temperature is lower than 0℃.
The humidifier’s valve of air-conditioner should be （）,...
单项选择题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
