...写代发 关键词：铁路运输经济；铁路防洪；应急物资储备；多目标规划；选址 [gap=1180]Keywords: railway transportation economy; railway flood prevention; emergency materials reserve; multi-objective plan; l..
基于8个网页-相关网页
Security in railway transportation economy is the foundation of national economy security.
铁路运输经济安全是国民经济安全的基础。
Calculating the demand flexibility of the industry, the result shows that there is great demand of railway transportation industry, there is possibility that the industry has scale economy.
利用替代计算的方法计算铁路需求弹性，证明铁路运输产业存在着巨大的市场需求，该产业存在规模经济的可能性。
Railway is a nation's important infrastructure, and also the big artery of national economy and the backbone of the transportation system.
铁路是国家重要的基础设施、国民经济的大动脉、交通运输体系的骨干。
应用推荐