small diameter and deep hole
small diameter and deep hole
直径小，孔深
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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。
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