In a refrigeration system, foaming of the crankcase oil may cause the （）.

A.poor distillate quality
B.reduced evaporator capacity
C.low brine concentration
D.improper vacuum regulation

A.refrigerant boiling out of solution from the lube oil
B.liquid refrigerant flooding the compressor and system
C.lube oil viscosity being reduced by refrigerant dilution
D.compressor suction pressure suddenly increasing

A.It is corrosive
B.It is odorless
C.It is visible as h blue fog
D.It has a distinctive taste