In this article, the principal factors affecting hole curvature are analysed, the principle of anti-deflecting packed hole assembly design is discussed.
本文分析了影响井眼曲率的主要因素，论述满眼防斜钻具组合设计的原则。
The day before my graduation from a high school in St. Louis, the principal called an assembly.
我从圣·路易斯毕业的前一天，校长召集我们开了个会。
All the tools include principal of the drill tools, overshot assembly, drill rods, holding dog, circle wrench and etc.
整套钻具包括：钻具总成、打捞器、钻杆、绞车、提引器、夹持器及自由钳等部件。
All the tools include principal of the drill tools, overshot assembly, drill rods, holding dog, circle wrench and etc.
整套钻具包括：钻具总成、打捞器、钻杆、绞车、提引器、夹持器及自由钳等部件。
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