试判断图示电路ab端的等效电路是（） 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32670' and id < 2598677 and id<>'2598677' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32670' and id > 2598677 and id<>'2598677' order by id asc limit 5