单选题The air-conditioner is running in the winter and to be stopped, we should（）Aclose Fan and Humidifier at the same timeBfirstly close Fan and then close humidifier immediatelyCfirstly close humidifier and then close Fan immediatelyDfirstly close humidifier and then close Fan after 30 seconds
单选题
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
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