The paper size is not valid. Check the values for Width and Height under paper.

纸张大小无效。请在“纸张”下检查“宽度”和“高度”的值。

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This paper introduces the manufacture of sealing surface (valve body) about great size check valve and analyzes the choices and the decisions about geometrical parameters of tools.

介绍了大口径止回阀阀体密封面的加工方法，分析了刀具几何参数的选择与确定。

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