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我们现在看到的欧姆定律是个多么简单的公式,可是德国物理学家欧姆为了研究这个问题,却花费了10年的心血．在欧姆的时代,当时的实验条件很差,没有现在
Ohm’s law we are now seeing is a simple formula, but the German physicist Ohm spent 10 years of hard work in order to study this issue. In the era of ohms, the experimental conditions at that time were poor and there was no present