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。
Check the paper size and paper to determine the paper-feed tray.
查抄纸，猜测纸尺寸与送纸器抵髑。
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。
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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