These results can serve to design the screw box and housingscrew and other heavy power screws.
所得结果,可供轧钢机械和有关人员设计压下螺旋以及其他重载传动螺旋时参考。
2
Small size bent housingscrew drill with high build rate must be developed to meet the requirements of sidetracking the short to medium radius horizontal well.