同步发电机的励磁系统的作用有（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32656' and id < 2596488 and id<>'2596488' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32656' and id > 2596488 and id<>'2596488' order by id asc limit 5