图示电路中网孔1的网孔电流方程为（）。 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32670' and id < 2598706 and id<>'2598706' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32670' and id > 2598706 and id<>'2598706' order by id asc limit 5