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教材中是用伏安法测电阻,而在实际应用中伏特表与安培表不能同时提供,这样就可以用下面的特殊方法。
In the textbook, the volt-ampere method is used to measure the resistance. In practical applications, the voltmeter and the ampere meter cannot be provided at the same time. In this way, the following special methods can be used.