某变压器保持额定电压不变，铁芯不变，若要减小绕组铜耗,可采取的措施为（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69321' and id < 4487858 and id<>'4487858' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69321' and id > 4487858 and id<>'4487858' order by id asc limit 5