单项选择题
Excessive lube oil consumption by a reciprocating air compressor can be caused by （）.
A.using a slightly dirty air filter B.using oil having an excessive viscosity C.intercooler or after-cooler leaks D.carrying the oil level higher than normal
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 （）.
单项选择题 Under normal operating conditions, the highest temperature and pressure conditions existing in a flash-type evaporator will occur in the （）.
