Methods: The split-half method and the equivalent form method were used, and the concurrent validity and predictive validity of the criterion-related validity were tested.

方法：采用分半相关法，复本法以及效标关联效度的同时效度和预测效度进行检验。

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Method of completing square is often used when transforming a quadratic form into a normal one, whose process is equivalent to making the relevant matrix contract diagonal.

二次型化标准形常采用配方法，而二次型化标准形等价于它的矩阵合同对角化，文中利用初等矩阵和初等变换之间的关系。

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Researches show that the equivalent load method couldn't be used to calculate the prestressing action in the combination form, but the method of restraining secondary moments should be used.

研究表明，这种组合线形不能按等效荷载法来计算预应力的作用，而应采用约束次弯矩法来计算。

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