Excessive oil foaming in the crankcase of a refrigeration compressor at start up can cause（）.<br>A:compressor damage from improper lubrication<br>B:refrigerant absorption by the lubricant<br>C:increased viscosity in the lubricant<br>D:carbon deposit on the compressor suction valves

Excessive oil foaming in the crankcase of a refrigeration compressor at start up can cause（）.
A:compressor damage from improper lubrication
B:refrigerant absorption by the lubricant
C:increased viscosity in the lubricant
D:carbon deposit on the compressor suction valves

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