通过对双铰模型与单铰模型的比较发现，双铰模型计算的结果与单铰模型计算的结果很接近，单铰模型作为一个近似模型具有一定的合理性。
Calculations of a double hinge model are compared with that of the single hinge model. It demonstrates that single hinge model is reasonable as an approximation of this model.
针对光导开关产生的非线性电脉冲进行合理化近似并建立数学模型。
Maths model of nonlinear electric pulse generated by PCSS's is built.
应用粗糙集理论计算相同层次两两评价指标的近似质量差，根据差的大小确定指标重要性，并通过实例证明了该模型的合理性和正确性。
In the model, approximate quality difference of two evaluations in the same level is computed by rough sets, and the importance degree is determined by difference. The model is validated by instance.
应用粗糙集理论计算相同层次两两评价指标的近似质量差，根据差的大小确定指标重要性，并通过实例证明了该模型的合理性和正确性。
In the model, approximate quality difference of two evaluations in the same level is computed by rough sets, and the importance degree is determined by difference. The model is validated by instance.
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