单选题6.18

金属导体的电阻随温度升高而增大，其主要原因是（）。

发布于 2021-02-22 21:09:32

【单选题】
A 电阻率随温度升高而增大$
B $ 导体长度随温度升高而增大$
C $ 导体的截面积随温度升高而增大$
D $ 不确定

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