求图所示电路的等效电阻，其中=====3Ω,=（）。 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='33896' and id < 2717338 and id<>'2717338' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='33896' and id > 2717338 and id<>'2717338' order by id asc limit 5