电力系统在运行中发生三相短路时，通常出现(    )现象。  

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69462' and id < 4498618 and id<>'4498618' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69462' and id > 4498618 and id<>'4498618' order by id asc limit 5