Theair-conditionerisrunninginthewinterandtobestopped,weshould（） A: closeFanandHumidifieratthesametime B: firstlycloseFanandthenclosehumidifierimmediately C: firstlyclosehumidifierandthencloseFanimmediately D: firstlyclosehumidifierandthencloseFanafter30seconds
Theair-conditionerisrunninginthewinterandtobestopped,weshould（） A: closeFanandHumidifieratthesametime B: firstlycloseFanandthenclosehumidifierimmediately C: firstlyclosehumidifierandthencloseFanimmediately D: firstlyclosehumidifierandthencloseFanafter30seconds
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