单选题In the refrigeration system, a shortage of refrigerant is indicated by （）.Athe compressor short cycling on high pressure cut out switchBhigh suction pressureChigh head pressureDbubbles in the sight glass
单选题
In the refrigeration system, a shortage of refrigerant is indicated by （）.
A
the compressor short cycling on high pressure cut out switch
B
high suction pressure
C
high head pressure
D
bubbles in the sight glass
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