中国有色金属产业结构升级演进研究 |
刘贻玲,郑明贵 |
A Study on the Industrial Structure Upgrading Evolution of Non-ferrous Metal in China |
Yiling LIU,Minggui ZHENG |
图1 1986—2019年有色金属产业结构(a)和向量夹角(b)变化速率 |
Fig.1 Change rate of nonferrous metal industrial structure(a)and vector angle(b) from 1986 to 2019 |