The main reason causing the low restoring rate of the small gauge casing damaged Wells in Daqing Oilfield is the inefficiency of drifting and reaming technology.
大庆油田小通径套损井修复率低的主要原因是套损井段扩径、找通道技术不过关。
In this paper, the application of high speed steel compound roll in splitting rolling of small gauge hot rolled ribbed bars at bar Plant of Shandong Shiheng Special steel Group co.
介绍了山东石横特钢集团有限公司棒材车间在小规格热轧带肋钢筋切分轧制中高速钢复合轧辊的应用情况,实践证明,高速钢轧辊可有效提高作业率及产品质量。
We find that the spontaneous breaking of gauge symmetry and supersymmetry can be realized, but it is difficult to make the quarks and leptons to acquire small masses.
发现规范对称自发破缺和超对称破缺是可以实现的,但在夸克轻子质量问题上遇到困难。
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