单相变压器一次侧加额定电压并保持不变，则二次侧额定电压大小（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69399' and id < 4492785 and id<>'4492785' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69399' and id > 4492785 and id<>'4492785' order by id asc limit 5