单选题Which of the listed methods of heat transfer takes place when two substances of different temperatures are in physical contact with each other?（）ARadiationBConductionCConvectionDEach of the above
单选题
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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