变压器利用电磁感应原理，能将（      ）转变为不同的电压等级。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68475' and id < 4421142 and id<>'4421142' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68475' and id > 4421142 and id<>'4421142' order by id asc limit 5