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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69474' and id < 4499604 and id<>'4499604' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69474' and id > 4499604 and id<>'4499604' order by id asc limit 5
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,则电阻R两端的电压U应等于( )。
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