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....
My heartfelt sympathy goes out to all the relatives.我对所有的亲人表示由衷的慰问。We would like to take this opportunity to convey our heartfelt condolences to the families of the victims.我们谨此向受害人家属表达我们衷心的慰唁.There was surely in it a qu...