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中文摘要：
铁路干线在我国空间经济发展中占有极为重要的地位，已成为我国经济布局的重要轴线。西北地区铁路沿线经济带是中国西北部重要的经济增长区域，未来发展前景十分广阔。基于点一轴发展理论，以西北地区兰新、包兰、西陇海、兰青四大铁路干线为发展主轴，以各铁路干线沿线经过的25座节点城市为研究对象，利用城市流强度模型，测度并比较了四大铁路经济带经济联系强度。
英文摘要：
Railway development in China＇s space economy occupies a very important position, has become a axis of the layout of our economy. Four economic corridors along railway in the northwestern region are important growing regions in northwester China and their development are very bright in the future. The economic contact of cities is very important among urban regions, which is measured to calculate the extrovert energy, the intensity of urban flow and the degree of tendency of 25 cities of four economic corridors along railway. The paper, first, introduce the main researches on the economic contact of the cities at home and abroad, including academic and empirical researches. Then, based on the analytical method of the intensity of urban flow, the paper narrates and studies the four economic corridors in northwestern region, which are Lan-Xin, Bao-Lan, Western Longhai and Lan-Qing economic corridors. What＇s more, the paper analyzes the economic contact strength of these four economic corridors.
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