单项选择题
Which of the listed methods of heat transfer takes place when two substances of different temperatures are in physical contact with each other?（）
A.Radiation
B.Conduction
C.Convection
D.Each of the above
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相关考题
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单项选择题
Which of the conditions listed will cause a refrigeration compressor to run constantly without simultaneously decreasing the temperature in the refrigerated space?（）
A.Shortage of refrigerant oil
B.Slight shortage of refrigerant
C.Excessive condenser cooling water flow
D.Faulty expansion valve -
单项选择题
Air compressor cylinder un-loaders enable the compressor to （）.
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 -
单项选择题
The movement of heat within a fluid, caused by the application of thermal energy, is called （）.
A.radiation
B.conduction
C.convection
D.condo-radiation
