导体的集肤效应系数与（  ）无关。 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69482' and id < 4500339 and id<>'4500339' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69482' and id > 4500339 and id<>'4500339' order by id asc limit 5