单项选择题
In which of the listed refrigeration system components does superheating of the refrigerant take place?（）
A.Expansion valve B.Evaporator C.Drier D.Receiver
单项选择题 Excessive lube oil consumption by a reciprocating air compressor can be caused by （）.
单项选择题 The effect of high vapor superheat in a refrigeration system, is a/an （）.
单项选择题 A dirty intercooler on an air compressor will cause （）.
