Excessive oil foaming in the crankcase of a refrigeration compressor is most likely to occur（） when the compressor.<br>A:has continuously for a long period<br>B:suction pressure is below normal<br>C:oil level is below normal<br>D:starts after a long idle period

Excessive oil foaming in the crankcase of a refrigeration compressor is most likely to occur（） when the compressor.
A:has continuously for a long period
B:suction pressure is below normal
C:oil level is below normal
D:starts after a long idle period

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