http://weld21.com/news/wzdt/20020605144435.htmlhttp://www.chinabyte.com/20020605/1614568.shtmlhttp://weld21.com/news/wzdt/20020514143254.htmlhttp://www.cctv.com/lm/55/32/38376.htmlhttp://weld21.com/news/rdwz/20040318213136.htmlhttp://tech.qianlong.com/28/2004/03/12/71@1936654.htm