单选题In a direct expansion type multi-box refrigeration system, the compressor is set up to cycle on and off by the（）ApressurestatBhigh pressure cutoutCsolenoid valveDlow pressure cutout switch
单选题
In a direct expansion type multi-box refrigeration system, the compressor is set up to cycle on and off by the（）
A
pressurestat
B
high pressure cutout
C
solenoid valve
D
low pressure cutout switch
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