应用等效变换的方法，R=4Ω,图示电路中的为（）. 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32670' and id < 2598681 and id<>'2598681' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32670' and id > 2598681 and id<>'2598681' order by id asc limit 5