Rm为激磁电阻，是表征（     ）的等效参数。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68478' and id < 4421419 and id<>'4421419' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68478' and id > 4421419 and id<>'4421419' order by id asc limit 5