图示电路中节点a的节点方程为（）。 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32629' and id < 2594613 and id<>'2594613' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32629' and id > 2594613 and id<>'2594613' order by id asc limit 5