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请问一下应该怎样分析如图所示电路的输入阻抗，虽然给出了结果，但是我确实是看不太明白。大家能帮忙解惑一下吗。谢谢
u can refer to http://pirun.ku.ac.th/~fscinrn/Nuclear%20Instrument/node113.html
