当变压器的负载系数 β=1 时，其铜损与铁损的关系通常是（  ）？（0.5）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69423' and id < 4495233 and id<>'4495233' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69423' and id > 4495233 and id<>'4495233' order by id asc limit 5