A.rise
B.fall
C.be maintained constant
D.None of the above is true
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A.raised
B.risen
C.reduced
D.maintained constant
A.humidity
B.dry
C.steam
D.oil
A.condenser
B.regurgitate
C.evaporator
D.boil coil
A.liquid receiver
B.compressor
C.condenser
D.cooling coil
A.evaporator
B.condenser
C.expansion valve
D.compressor
最新試題
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
The major source of chemical contaminants in hydraulic fluid is （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
The usual symptoms of cavitation in a centrifugal pump is （）.
Which of the listed pumps is NOT a positive displacement pump?（）
The output volume of a positive fixed displacement pump can be changed only by （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.