实用计算中，取同步发电机的负序电抗为(  )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69514' and id < 4503420 and id<>'4503420' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69514' and id > 4503420 and id<>'4503420' order by id asc limit 5