三相短路时单位长度导体所受短路电动力的大小，取决于（  ）。  

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69482' and id < 4500342 and id<>'4500342' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69482' and id > 4500342 and id<>'4500342' order by id asc limit 5