THREE STAGES--Over the 1981--1994 period,the import and exportstructure of China’s nonferrous metalsproducts can be devided into three stagesThey are:1981-1985,1986-1989,and 1990-1994.Over the wholeperiod,the percentage of raw materi-als in exports,and that of smeltingproducts as well as semis in importswere increasing.