电网一次调频是由发电机调速系统的(    )特性引起的频率调整作用。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id < 4421585 and id<>'4421585' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id > 4421585 and id<>'4421585' order by id asc limit 5