理想变压器具有下列哪些性质（  　）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68472' and id < 4420939 and id<>'4420939' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68472' and id > 4420939 and id<>'4420939' order by id asc limit 5