This paper aims to study optimization of export commodity structure and upgrade of industrial structure in Heibei province under the WTO.
本文是在加入WTO的大背景下，以优化河北省出口商品结构和提升产业结构为主要研究目的。
The knowledge of network capacity expansion is widely used in Transformation of urban transport network, power network upgrade, and communication network optimization etc.
城市交通网络改造、电力网络升级、通信网络优化等，都要用到网络容量扩张方面的知识。
Metal powder materials have great significance to promote the nonferrous metals industry and chemical industry to upgrade its technology and promote the optimization of the industrial structure.
金属粉体材料对促进有色行业和精细化工行业技术升级，推动优化产业结构具有重要意义。
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