单项选择题
A.bubbling refrigerant B.overheating and oxidation C.lowered operating temperatures D.reducing the cloud or flash point
Which of the following centrifugal pump components conv...
单项选择题Which of the following centrifugal pump components converts the liquid kinetic energy of velocity to the potential energy of pressure?（）
A.Impeller B.Electric motor C.Volute D.Eye
Excessive circulation of the lubricating oil with the r...
单项选择题Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause （）.
A.carbon deposits on the compressor suction valves B.the evaporator temperature to increase C.rapid corrosion of the thermal expansion valve D.no operating problems
Scale accumulation on evaporator heat exchange surfaces...
单项选择题Scale accumulation on evaporator heat exchange surfaces （）.
A.increases brine density B.increases distillate salinity C.reduces metal corrosion D.reduces heat transfer
