Constant superheat is maintained at the evaporator outlet of a refrigeration coil by a（）<br>A:solenoid valve<br>B:low pressure cutout switch<br>C:king valve<br>D:thermal expansion valve

Constant superheat is maintained at the evaporator outlet of a refrigeration coil by a（）
A:solenoid valve
B:low pressure cutout switch
C:king valve
D:thermal expansion valve

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