For present shortcoming of water depth of uniform flow in circular section, which is great calculating error and small application scope, this paper desired to get a new approximate formula.
针对目前圆形断面均匀流水深计算公式存在计算误差大、适用范围小的弊端，欲提出一种新的近似计算公式。
Conclusion the approximate formula of circumferential stress and the absolute error is accepted, which is easy for the application.
结论周向应力的近似公式及其绝对误差的公式简单易行，便于临床应用。
Using polar coordinate system to set out, the coordinate computing formula and the error of its approximate formula are discussed of any point in line.
本文用极坐标法放样，讨论了线路曲线中任一点坐标计算公式及其近似公式的误差大小。收藏。
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