A.negative displacement type
B.turbine type
C.positive displacement type
D.mixed-flow type
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A.well ventilated
B.well clean
C.in good order
D.more room
A.lower
B.higher
C.the lower
D.the higher
A.evaporation
B.frosting
C.condensing
D.compressing
A.consume
B.distill
C.run
D.operate
A.bottom
B.top
C.center
D.periphery
最新試題
One cause of high head pressure occurring in a refrigeration system can be （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
A pressure drop through the refrigerant liquid line may cause （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
Which of the following statements is correct concerning heat transfer?（）
The rate of heat transfer from a hot region to a cold region is affected most by the （）.