natural frequency interval 固有频率区域
This paper focuses on a study of the classification method of natural disaster in the view of attribute interval recognition theory.
从属性区间识别理论的角度，探讨了自然灾害的等级划分方法。
Under a particular social economic circumstance, there is some appropriate and feasible interval of interest rates without abstract natural interest rates.
抽象的自然利率终属子虚乌有，而在一定的社会经济条件下，却存在适度的、可行的利率区间。
An interval analysis method was proposed for the influence analysis of the model error to the computational results of natural frequency of structures.
给出了一定误差水平下的模型误差对固有频率计算结果影响程度分析的区间方法。
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