利用空载特性和短路特性确定Xd 的不饱和值，Xd =（      ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68476' and id < 4421255 and id<>'4421255' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68476' and id > 4421255 and id<>'4421255' order by id asc limit 5