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Which of the problems listed represents the major difficulty encountered with thermal expa


Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?

A.Lube oil passing through the system

B.Moisture or foreign matter collecting at the valve seat and orifice

C.Variable spring tension caused by the changing temperature

D.Frost on the liquid line

请帮忙给出正确答案和分析,谢谢!

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