电力系统发生短路时，下列哪些量是突变的(    )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69461' and id < 4498403 and id<>'4498403' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69461' and id > 4498403 and id<>'4498403' order by id asc limit 5