单项选择题
A pressure drop through the refrigerant liquid line may cause （）.
A.solenoid valve to seize B.compressor to hunt C.formation of flash gas in the liquid line D.expansion valve to freeze open
单项选择题 Low compressor head pressure in a refrigeration system can be caused by（）.
单项选择题 Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
单项选择题 The usual symptoms of cavitation in a centrifugal pump is （）.
