In a refrigeration system, foaming of the crankcase oil may cause the （）.<br>A:expansion valve to overfeed<br>B:compressor to knock<br>C:water regulating valve to fail<br>D:crankcase drains to plug

In a refrigeration system, foaming of the crankcase oil may cause the （）.
A:expansion valve to overfeed
B:compressor to knock
C:water regulating valve to fail
D:crankcase drains to plug

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