It also discusses the framework of theory-based validity and scoring validity of the tests.
此外，文章还讨论商务英语考试的理论效度和评分效度。
A fractal prediction model of sliding friction forces was derived based on the fractal geometry theory. The validity of the model was verified theoretically.
基于分形几何理论，推导出了滑动摩擦力分形预测模型，并从理论上对该模型的正确性进行了分析。
The proposed prearrange PID control algorithm based on the basic theory of algorithm with some theory ratiocinations, experiment validity.
结合PID算法的基础原理，经过适当的理论推导、实验验证，提出了预置PID控制算法。
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