电力系统不对称短路包括(  )种短路类型。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69513' and id < 4503338 and id<>'4503338' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69513' and id > 4503338 and id<>'4503338' order by id asc limit 5