用电设备一般允许电压偏移为(    )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69497' and id < 4501905 and id<>'4501905' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69497' and id > 4501905 and id<>'4501905' order by id asc limit 5