单选题
Excessive oil foaming in the crankcase of a refrigeration compressor at start up can cause（）.
发布日期：2021-03-22
compressor damage from improper lubrication
refrigerant absorption by the lubricant
increased viscosity in the lubricant
carbon deposit on the compressor suction valves
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Foaming of the oil in a refrigeration compressor crankcase is caused by （）.
In a refrigeration system, foaming of the crankcase oil may cause the （）.
In a refrigeration system, foaming of the crankcase oil may cause the （）.
Foaming of the oil in a refrigeration compressor crankcase is caused by （）.