In order to derive the regional dual-nuclei structure by the method of building mathematical model, this paper redefines regional accessibility and establishes the formula to calculate it.
依据重新定义的区域可达性，本文在均质平原背景的假设条件下推导出了区域双核结构模式的形成机制及相应的参数条件。
In macroscopic, regional comprehensive transportation cost is relative to regional integrated transportation accessibility and the scale of passenger and freight.
在宏观尺度上，区域综合运输成本是区域综合交通可达性和客货运规模的函数。
Third, the use of available medical services is poor, although improving in recent years, however, on the regional terms of accessibility is still poor.
第三，医疗服务利用可及性较差，近几年虽有改善但是就地区而言，可及性仍然较差。
Third, the use of available medical services is poor, although improving in recent years, however, on the regional terms of accessibility is still poor.
第三，医疗服务利用可及性较差，近几年虽有改善但是就地区而言，可及性仍然较差。
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