图1-24所示电路中B点的电位为（ ）。 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30079' and id < 2435298 and id<>'2435298' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30079' and id > 2435298 and id<>'2435298' order by id asc limit 5