单选题Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?（）ALube oil passing through the systemBMoisture or foreign matter collecting at the valve seat and orificeCVariable spring tension caused by the changing temperatureDFrost on the liquid line
单选题
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
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