电阻 与 并联，等效电阻为：
Answer and explanation
Correct answer: D.
其他选项为什么不对： 代入检验，、、都与算出的 不符。
- Step 1: 并联电阻满足 。
- Step 2: 所以 。
Answer
.
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Correct answer: D.
Free questions with an explanation for every one, and full timed Gaokao mock tests.