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Which of the listed statements describes the reason why oil foaming occurs when starting a refrigeration compressor?
A) This phenomenon is inherent only in hermetically sealed units and is always provisional.
B) This will occur only if crankcase heaters are used.
C) This condition is the result of the sudden low-pressure created in the crankcase at start up causing the release of refrigerant absorbed within the oil.
D) If the oil level is not initially high, this condition is the result of agitation created by the movement of the mechanical components.
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