电机铁心一般由彼此绝缘的硅钢片叠成，其目的是（    ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69208' and id < 4481043 and id<>'4481043' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69208' and id > 4481043 and id<>'4481043' order by id asc limit 5