The method of calculating the joint ductility is studied employing the empiric equation and some assumptions.
利用该公式和一些假定，对节点延性的计算方法进行了探讨。
Besides, the experimental results are proved by regression analysis so as to obtain the empiric formula applicable to engineering.
同时，还对试验结果进行了方差分析和逐步回归，获得了适合于工程应用的经验公式。
Introduction of the selection procedure of control ball valve and butterfly valve and the empiric selection of the coefficient in calculation.
介绍了调节型球阀和蝶阀选用的步骤及计算中一些系数的经验取法。
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