电压无功优化的主要目的是(    )。  

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69463' and id < 4498554 and id<>'4498554' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69463' and id > 4498554 and id<>'4498554' order by id asc limit 5