题目内容
理想电压源的源电压为U,则其内阻为()。
2021-01-08
B.
C.![1610069035212401.png](https://www.changlipeixun.com/d/file/2021/01-08/1610069035212401.png)
D.![1610069035940793.png](https://www.changlipeixun.com/d/file/2021/01-08/1610069035940793.png)
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