单项选择题
A.nonexistent B.for controlling pressure C.for controlling superheat D.for controlling the solenoid valve
In a compression refrigeration plant the hot, high pres...
单项选择题In a compression refrigeration plant the hot, high pressure refrigerant gas is cooled by the sea water and becomes liquid in the （）.
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)
