电力系统振时的特征有(   )。（2.0）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69421' and id < 4494925 and id<>'4494925' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69421' and id > 4494925 and id<>'4494925' order by id asc limit 5