电路如图所示，试求电压U=（）。 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32670' and id < 2598671 and id<>'2598671' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32670' and id > 2598671 and id<>'2598671' order by id asc limit 5