根据现行国家标准，下列哪项指标不属于电能质量指标?(     )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69437' and id < 4496803 and id<>'4496803' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69437' and id > 4496803 and id<>'4496803' order by id asc limit 5