得到了根据插值函数来计算刚度矩阵秩的计算公式，并对几种降阶积分单元进行了验算。

A formula based on the interpolation for the rank of the element stiffness matrix is presented, and some reduced integration elements are examined.

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讨论设计矩阵列降秩时，线性回归模型的影响分析。

The influence of linear model with deficient - rank is discussed.

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