Which of the following conditions must exist for heat to flow from one object to another?（）<br>A:The two objects must be in physical contact<br>B:The two objects must be the same size<br>C:There must be an existing temperature differential<br>D:There must be an existing weight differential

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

出自：海船船员证

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