单项选择题
A.separating oil too fast
B.the sensor flushed badly
C.the discharge solenoid value out of order
D.too low heating temperature
单项选择题 Because the flow rate of supply water pump is too large, oily water separator does not work wellWhich of the following is not the reason?（）
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
单项选择题 The air-conditioner is running in the winter and to be stopped, we should（）