OBJECTIVE: to observe the methods and results of screw insertion and histocompatibility of host using Kirschner wire plus tappingtechnique.
目的：以徒手克氏针加叩击法制备胸椎椎弓根钉道，观察螺钉置入的准确性及置入后与宿主的组织相容性反应。
2
Many techniques are applied to adjustment and tapping potential including directed drilling, sidetrack drilling technique and hydrodynamic methods.
应用定向斜井及侧钻井技术、水动力学方法等进行调整挖潜。
3
Trials are conducted on the slag retaining technique in the large open hearth with dual tapping spouts at Baotou Iron &Steel Company and marked results have been achieved in the tests.