造成系统电压下降的主要原因是：(    )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69458' and id < 4498302 and id<>'4498302' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69458' and id > 4498302 and id<>'4498302' order by id asc limit 5