对铁路行包od运量的预测提出一种基于重力模型的改进方法。
The paper puts forward an improved method on the basis of gravity model to forecast the od freight volume of railway luggage and parcel transportation.
本文针对单线铁路混凝土重力式桥墩，研究了考虑材料非线性和几何非线性的分析方法。
In this paper, an analysis method in consideration of the nonlinearity of materials and geometry for gravity concrete piers in railway Bridges is studied.
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