电力系统中无功功率源包括(    )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69459' and id < 4498352 and id<>'4498352' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69459' and id > 4498352 and id<>'4498352' order by id asc limit 5