According to the detailed introduction to the basic principle and the mining method of URRS, USSR, as a new technical measure, is imported to mine gas so as to improve extracting quantity.
本文通过对超短半径径向钻井系统的基本原理和施工方法的详细介绍，试图把超短半径径向钻井系统这项先进技术作为一个新的技术手段引入煤层气开采中来，以提高煤层气的采出率。
Mining recovery is a main economic-technical index to measure mine enterprise's levels of production management and resources comprehensive utilization.
回采率是衡量矿山生产技术管理、资源综合利用水平的一项主要的经济技术指标。
Mining recovery is a main economic-technical index to measure mine enterprise's levels of production management and resources comprehensive utilization.
回采率是衡量矿山生产技术管理、资源综合利用水平的一项主要的经济技术指标。
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