Leaching of copper from chalcocite with acidic acetonitrilecopper sulphate system was studied.研究了用酸性乙腈硫酸铜体系从辉铜矿中提取铜.The paper discusses a new method for producing cupric feed copper sulfate by chalcocite and ehalcopyite....
Double Happiness Super Standard Ball standard of ITTF for any match.红双喜超级三星乒乓球国际乒联(ITTF)特准之比赛用球.ITTF stands for International Table Tennis Federation.ITTF是国际乒乓球联合会的简称.What does ITTF stand for?ITTF表示什么?...