下图所示电路中，结点A的电压方程为：。（）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32629' and id < 2594634 and id<>'2594634' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32629' and id > 2594634 and id<>'2594634' order by id asc limit 5