由发电机调速系统的频率静态特性而引起的调频作用称为(    )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id < 4421519 and id<>'4421519' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id > 4421519 and id<>'4421519' order by id asc limit 5