短路电流的热效应由（  ）组成。 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69482' and id < 4500383 and id<>'4500383' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69482' and id > 4500383 and id<>'4500383' order by id asc limit 5