Questionnaires and multiple statistic method are used to explore the PM leadership behavior of head-teachers in Junior Middle School.
本研究采用问卷法和多元统计等方法对初中班主任的PM领导行为进行了实证研究。
On the basis of mathematical statistic, using the method of multiple regression analysis, the practical calculating formula of the shear lag coefficient in thin-walled curved box girders is derived.
在两端简支的边界条件下采用分离变量法求解偏微分方程 ，得到用级数表示的应力解 ，然后根据剪力滞系数的定义即可得到组合箱梁翼板的剪力滞系数。
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