单选题A feeler or thermal bulb is used for the expansion valve to （）.Adetect the temperatureBdetect the pressureCheat the refrigerantDaccelerate the refrigerant
单选题
A feeler or thermal bulb is used for the expansion valve to （）.
A
detect the temperature
B
detect the pressure
C
heat the refrigerant
D
accelerate the refrigerant
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