单选题Which of the following modes of heat transfer does NOT require any physical contact between a warmer and a cooler substance?（）ARadiationBConductionCNatural convectionDAll of the above
单选题
Which of the following modes of heat transfer does NOT require any physical contact between a warmer and a cooler substance?（）
A
Radiation
B
Conduction
C
Natural convection
D
All of the above
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