威廉姆逊关于区域经济差距走势的倒U字型观点是正确的，但由于其方法的不完善，引起了争论。
The converse-U theory proposed by Williamson about the region-difference trend is acceptable, but faultiness exists in its methodology, which has caused much debate.
本文就区域经济规划的理论、原则、内容和方法进行了研究和阐述。
This paper studied and expounded the theory, principle, content and method of the regional economical planning.
本论文重点对区域经济与物流关系、数据基础预测和网络构建方法等三个基本问题进行了研究。
Three main problems have been solved in this thesis: the relationship of the regional economy and logistics, the data foundation forecasting and methods of the network constructing.
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