单选题Which of the following conditions must exist for heat to flow from one object to another?（）AThe two objects must be in physical contactBThe two objects must be the same sizeCThere must be an existing temperature differentialDThere must be an existing weight differential
单选题
Which of the following conditions must exist for heat to flow from one object to another?（）
A
The two objects must be in physical contact
B
The two objects must be the same size
C
There must be an existing temperature differential
D
There must be an existing weight differential
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