题目内容
下列说法中正确的是( )
A.由![]() ![]() ![]() ![]() |
B.由![]() ![]() ![]() ![]() |
C.各种材料的电阻率都与温度无关,材料的电阻率越大,导电性能越差 |
D.一粗细均匀铜丝电阻为![]() ![]() ![]() |
D
试题分析:根据电阻定律
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151356166599.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151356166599.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151356369460.png)
点评:此类题型考察了对电阻定律的理解
![](http://thumb2018.1010pic.com/images/loading.gif)
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