The paper discussed problem existed in construction and maintenance work of county highway, proposed some methods for solving problem.
对县乡公路近几年在建养工作中存在的问题进行了论述，提出了解决问题的办法。
Analysis methods for calculating structure internal forces by subinterval method are investigated. Some methods for solving structure accelerations are derived.
对应用子区间法分析结构动力反应进行了研究，确定出几种求解结构加速度的方法。
In this article, we introduce the principle of optimality in dynamic programming and some methods for solving certain simple variable and multi-variable problems.
本文引述了动态规划中的最优化原则和一些有关单变量和多变量问题的求解方法。
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