从技术和经济角度看，最适合担负系统调频任务的发电厂是(    )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id < 4421512 and id<>'4421512' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id > 4421512 and id<>'4421512' order by id asc limit 5