A.Radiation
B.Conduction
C.Convection
D.Each of the above
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A.Shortage of refrigerant oil
B.Slight shortage of refrigerant
C.Excessive condenser cooling water flow
D.Faulty expansion valve
A.vary their speed according to temperature and load
B.start and come up to speed before air compression begins
C.change speed according to overload demands
D.reduce compressed air charge density
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A grease gun is generally used to lubricate a （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）