The drill string of ERW is taken as research object, the dynamic problem is brought forward during makinghole, and the mechanics model about each dynamic action is established.
以大位移井钻柱的部分或整体为研究对象，提出了钻井各种动态问题，建立了钻柱的各种动态行为的力学模型。
2
Therefore, this thesis did thorough researches in allusion to the problems of makinghole processing technology in the composite armor and optimizing craft parameters when it was in mass production.
因此，论文主要研究面向批量生产时复合装甲制孔加工工艺和工艺参数优化问题。
3
Peter shouted for help because he knew the hole meant that the sea was making its way through the sea wall, but no answer came.