The air-conditioner is running in the winter and to be stopped, we should（）<br>A:close Fan and Humidifier at the same time<br>B:firstly close Fan and then close humidifier immediately<br>C:firstly close humidifier and then close Fan immediately<br>D:firstly close humidifier and then close Fan after 30 seconds

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

出自：海船船员证

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