摘要:Brass is any alloy of copper and zinc; the proportions of zinc and copper can be varied to create a r[阅读全文]
摘要:Antimony (pronounced /æntɪmənɪ/ (UK) or /æntɨmoʊni/ (US)) is a c[阅读全文]
摘要:简介:总部设在华盛顿的美国钢铁协会(American Iron & Steel Institute)成立于1855年,官方网站http://www.steel.org//AM/Template.[阅读全文]