同步发电机带三相对称负载运行时，转子励磁绕组（      ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68475' and id < 4421156 and id<>'4421156' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68475' and id > 4421156 and id<>'4421156' order by id asc limit 5