电力系统短路时最严重的后果是(     ) 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69437' and id < 4496789 and id<>'4496789' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69437' and id > 4496789 and id<>'4496789' order by id asc limit 5