若二端网络N及其u-i特性曲线如图所示，则其等效电路为（）。 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32670' and id < 2598744 and id<>'2598744' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32670' and id > 2598744 and id<>'2598744' order by id asc limit 5