It is difficult to avoid technique problem for drill eccentricity in hole machining all along.

钻孔偏心一直是孔加工中难以避免的技术难题。

youdao

It is difficult to avoid technique problem for drill eccentricity in hole machining all along.

钻孔偏心一直是孔加工中难以避免的技术难题。

youdao