变压器铁心采用导磁性能好、相互绝缘的硅钢片叠成，其目的是为了（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69399' and id < 4492803 and id<>'4492803' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69399' and id > 4492803 and id<>'4492803' order by id asc limit 5