二次调频限制的是(  )的负荷变动引起的频率偏移。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69512' and id < 4503310 and id<>'4503310' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69512' and id > 4503310 and id<>'4503310' order by id asc limit 5