检测圆锥管螺纹基面中径的方法有很多，但测量过程复杂。

There are many ways to measure base-level pitch diameter of cone-shaped thread.

youdao

检测圆锥管螺纹基面中径的方法有很多，但测量过程复杂。

There are many ways to measure base-level pitch diameter of cone-shaped thread.

youdao