最近国家物资局金属回收局汇编印出了一份内部学习资料——《铜、铝、铅、锌、锡的化学成份及用途举例》。它专供金属回收系统的职工、业务技术人员以及管理和领导干部学习有色金属回收知识之用,也可供青工的业务培训之用。本资料开本为350mm×205mm,页数不多(总页数为35页),单面印刷,每篇资料均 Recently, the Bureau of Metal Recycling of National Materials Administration compiled and published an internal study material - “Chemical Compositions and Uses of Copper, Aluminum, Lead, Zinc and Tin”. It is designed for employees of metal recycling systems, business and technical personnel as well as management and leading cadres to learn non-ferrous metal recycling knowledge, but also for business training for young workers. This information is 350mm × 205mm, the number of pages is small (the total number of pages is 35 pages), single-side printing, each document