Then, the design basis and principle about precipitation well distribution, the design and arrangement of well hole plane, the structure design and the construction method are clarified in detail.
阐述了降水井布设的设计依据与原则，井孔平面布设与结构设计及其施工方法。
The deep well coal road cable of small diameter hole and high pre-tension structure and craft were studied according to the condition of high stress and composite roof in Fengcheng coal field.
结合丰城矿区高地应力、合顶板等复杂地质条件，研究深井条件下煤巷锚索采用小孔径、加高预应力的结构形式和施工工艺。
Project Background: Active carbon is widely used due to its developed hole structure and prodigious surface area as well as adsorption capability, especially most used in environment protection area.
项目建设背景：活性炭具有发达的孔隙结构，有很大的表面积和吸附能力，因此该产品应用范围相当广泛，其中用量最多的是在环境保护领域。
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