The spatial structure of milk production in Shanghai has three hierarchies:the circular distribution, the system for milk traffic and the collective-distributive network.
圈层分布、奶流系统、收发网络是上海市奶业空间结构的三个层次。
On the basis of the Four Phases method and the theory of urban spatial structure, the research focuses on the theory and the method of urban expressway network planning.
论文以“四阶段法”和城市空间结构理论为基础，对大城市快速路系统规划理论与方法进行了研究。
Four examples are illustrated, three of them are usually used in references, the rest one is a practical engineering structure, a spatial network of roof with diameter in 91m.
文后举了四个例子，其中三个是现在文献中常用的考题，还有一个是某结构工程的实例-91米直径的空问网架屋盖。
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