Secondly, the paper reviews the evolution of the scale structure of towns in county administrative areas. The spatial structure show changes from concentration to political regional balance, and changes to the grade-size differentiation.
其次，总结全省县域城镇规模结构的演变，划分出密集化向均衡化再向等级化的阶段变迁，并结合具体案例归纳县域城镇空间分布的四种主要模式：向心集中型、双中心分布型、多核心分布型和城市辐射型。
参考来源 - 江苏省县域城镇规模变动及机理研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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