In the refrigeration system, a shortage of refrigerant is indicated by （）.<br>A:the compressor short cycling on high pressure cut out switch<br>B:high suction pressure<br>C:high head pressure<br>D:bubbles in the sight glass

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

出自：海船船员证

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