最后根据程序计算结果，选取了换热器抽芯机主体金属结构的型钢规格和几何参数。
The size and geometric parameters of the rolling sections for the main body metal structure of the extracting core machine are selected according to the calculated results.
根据安全阀的实际结构和参数，利用三维建模软件Proe，结合计算数学模型的可行性，建立了安全阀流道的三维几何模型。
The 3-d geometrical model of relief valve was built by using PROE software, according to its actual structure and parameters as well as feasibility of computational mathematical model.
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