电路如图所示，表示无限阶梯网络，其a,b端口等效电阻为（） 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32670' and id < 2598673 and id<>'2598673' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32670' and id > 2598673 and id<>'2598673' order by id asc limit 5