The cutting head cut teeth was under high pressure, the shear force and random wallop at its tunneling work, cut teeth i......

对一些接线座的组织，性能进行了分析，找出接线座弹性达不到要求的原因，提出了用碳氮共渗工艺进行处理，使接线座弹性达到国外同类产品的......