Bearing parts in the process of hardening cooling by internal stress due to the formation of quenching cracks crack said.

轴承零件在淬火冷却过程中因内应力所形成的裂纹称淬火裂纹。

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The paper describes the feature, mechanism of formation, research methods and possible applications of jet halo of mobile heavy metal above oil bearing formation.

叙述了石油层上方重金属元素的射流晕分布特点、形成机制、研究方法及其可能的应用。

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Jurassic coal-bearing formation scatters over the northwestern China. The low-permeability sandstone reservoir occurs as the main reservoir type.

侏罗系煤系地层广泛分布于我国西北地区，低渗透砂岩储集层是其主要的储集层类型。

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Think about what this advancement has meant just in terms of access to the resources: When drilling into a hydrocarbon bearing formation 100 feet thick, vertical drilling would allow an operator to contact 100 feet of rock, which would limit your potential recovery to whatever oil or gas would flow into that length of pipe.

FORBES: Horizontal Drilling: A Technological Marvel Ignored