同步发电机定子磁场的转速为（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69469' and id < 4498999 and id<>'4498999' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69469' and id > 4498999 and id<>'4498999' order by id asc limit 5