对于同步发电机，铁心饱和时的Xd和铁心不饱和时的Xd满足（    ）关系。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69206' and id < 4480849 and id<>'4480849' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69206' and id > 4480849 and id<>'4480849' order by id asc limit 5