相应于异步电动机的励磁电抗Ｘm，在同步电机中有（        ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68477' and id < 4421319 and id<>'4421319' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68477' and id > 4421319 and id<>'4421319' order by id asc limit 5