电力系统大扰动主要指：各种短路故障(    ).非同期并网(包括发电机非同期并列)等。  

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69463' and id < 4498553 and id<>'4498553' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69463' and id > 4498553 and id<>'4498553' order by id asc limit 5