It is demonstrated that the errors of the unified valve model are dependent on the damping coefficient alone using a non-dimensional approach.
采用非量纲分析法，验证了统一模型的误差仅依赖于阻尼系数。
That 4-intersection model is necessary and sufficient for classifying topological relations between 2-dimensional spatial areas is proved, then these 3 different methods are unified.
证明了4交集模型对于分类二维空间区域间拓扑关系的充分必要性，从而将3种不同的研究方法统一起来。
That 4-intersection model is necessary and sufficient for classifying topological relations between 2-dimensional spatial areas is proved, then these 3 different methods are unified.
证明了4交集模型对于分类二维空间区域间拓扑关系的充分必要性，从而将3种不同的研究方法统一起来。
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