题目内容 (请给出正确答案)
提问人:网友l******8 发布时间:2022年5月1日 08:58
[单项选择题]

热导率的物理含义是()。

A.单位温度梯度下的热流量

B.单位温度梯度下的导热通量

C.单位温度梯度下的导热速率

D.不好说

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