戴维南定理的内容是:任何一个含独立源的线性二端网络,对其外电路而言,可以用一个电压源和电阻的串联组合来等效置换。
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what happened to the earth?Lots of ____ are ___.
What happened to the earth?Many ___ things are ___.
What happened to the earthMore and more ___ rain ___ the cities.
The ___ causes crop failure.