单项选择题
A.compressor B.condenser C.throttle valve D.evaporator
In the （） refrigeration compressor one end of the crank...
单项选择题In the （） refrigeration compressor one end of the crank shaft extends through the crankcase house for connection, via a coupling or pulley, to an external drive motor.
A.open-type B.hermetic C.semi-hermetic D.all the above
Which of the following will be desirable properties of ...
Which of the following will be desirable properties of refrigerant?（） (1) non-explosive (2) non-corrosive (3) that it doesn’t react with lubricants
A.(1), (2) and (3) B.(1) and (2) C.(1) and (3) D.(2) and (3)
In practice, the refrigerant flow after the evaporator ...
单项选择题In practice, the refrigerant flow after the evaporator is designed to ensure that the vapor leaving the evaporator is slightly （）.
A.saturated B.super-cooled C.wet D.superheated
