给你几个链接看看,好的给点分splay.asp?id=4448&keyword=Steel.htmsearch?q=cache:wOccnwMW1iEJ:www.technology.gov/Reports/Steel/cd91a.pdf+steel+industry&hl=zh-CN&ct=clnk&cd=6&gl=cn&st_usg=ALhdy2_m3h1skrTreViGyt0lxH-WHJoZ1g
给你几个链接看看,好的给点分
splay.asp?id=4448&keyword=
Steel.htm
search?q=cache:wOccnwMW1iEJ:www.technology.gov/Reports/Steel/cd91a.pdf+steel+industry&hl=zh-CN&ct=clnk&cd=6&gl=cn&st_usg=ALhdy2_m3h1skrTreViGyt0lxH-WHJoZ1g