当交流电源电压加到变压器一次绕组后，在一次侧绕组中会有（        ）电流流过。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68477' and id < 4421301 and id<>'4421301' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68477' and id > 4421301 and id<>'4421301' order by id asc limit 5