理想变压器具有下列哪些性质（   ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69471' and id < 4499933 and id<>'4499933' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69471' and id > 4499933 and id<>'4499933' order by id asc limit 5