电机铁心一般工作在磁化曲线的（    ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69320' and id < 4487825 and id<>'4487825' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69320' and id > 4487825 and id<>'4487825' order by id asc limit 5