若把一台单相一次侧电压U1和频率f1同时增加5%，其铁耗将（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69508' and id < 4502876 and id<>'4502876' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69508' and id > 4502876 and id<>'4502876' order by id asc limit 5