.变压器的铁芯一般采用（   ）叠制而成。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69454' and id < 4497900 and id<>'4497900' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69454' and id > 4497900 and id<>'4497900' order by id asc limit 5