有功功率与频率变化基本上无关的电力负荷有(    )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69457' and id < 4498212 and id<>'4498212' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69457' and id > 4498212 and id<>'4498212' order by id asc limit 5