图中所示是一个部分电路，a点的电位为（）。 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32627' and id < 2594491 and id<>'2594491' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32627' and id > 2594491 and id<>'2594491' order by id asc limit 5