理想变压器的功能有（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69074' and id < 4471068 and id<>'4471068' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69074' and id > 4471068 and id<>'4471068' order by id asc limit 5