在系统负荷最大负荷时将中枢点电压调至1.05UN，这是采用(    )方式。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69507' and id < 4502787 and id<>'4502787' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69507' and id > 4502787 and id<>'4502787' order by id asc limit 5