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电学中的黑箱问题是一类难度较大的问题,这类问题难就难在将电路元件隐藏于黑箱中,它要求根据题给条件推断箱内的电路结构。解答这类问题应遵循从易到难,从简单到复杂的原则,其中只含有电阻的黑箱问题的解答方法是:
The black box problem in electricity is a kind of difficult problem. It is difficult for such problems to hide the circuit components in the black box. It requires that the circuit structure in the box be inferred according to the conditions of the problem. Answering such questions should follow the principles from easy to difficult, from simple to complex. The solution to the black box problem with only resistance is: