变压器的等值电路中产生的是不变损耗的有(  )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69512' and id < 4503313 and id<>'4503313' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69512' and id > 4503313 and id<>'4503313' order by id asc limit 5