单选题When starting air-conditioner in the winter, we should open（）in sequence. Ⅰ.alve of warming Ⅱ.alve of humidifier Ⅲ.anAⅢ-Ⅱ-ⅠBⅢ-Ⅰ-ⅡCⅠ-Ⅲ-ⅡDⅡ-Ⅲ-Ⅰ
单选题
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
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