Utility value is the matter agent of environmental economics value, utility value relation assumes catenoid or netlike structure.
效用价值是环境经济价值的物质承担者，效用价值关系呈链状或网状结构。
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During form-finding of catenoid, when the viscosity coefficient was not more than0.7, the dynamic relaxation method taking damp into account had good convergence and the nodes distributed more even.