1. The gas grade appraising in the coal mine is a main approach to estimate whether a coal mine is a low or high gas mine, or coal &gas outburst one, and to prevent gas explosion and mine firing. 矿井瓦斯等级鉴定是确定煤矿属于低瓦斯矿井、高瓦斯矿井还是煤与瓦斯突出矿井以及预防煤矿瓦斯爆炸危险和矿井自然发火危险等的一个重要手段。
2. The mine shaft sinking with a mine shaft drilling is a reliable mine shaft construction method to pass through a deep and thick alluvium. 钻井法凿井是通过深厚冲积层最可靠的竖井施工方法。
3. Rare earth original mine, final mine, tailing mine and scoria were formed in the course of produce and letting. 稀土在生产和排放过程中形成的原矿、精矿、尾矿和矿渣都含有一定量的汞、铅和钍。
4. Magnesium mine, salt mine, Bromine mine, Piezoelectric Crystal. 镁矿，盐矿，溴矿，压电水晶，铸石用玄武岩。
5. To meet the structure and launch requirements of deep autonomous attack mine, a technique of uncapping system of box ring-like pressure mine girder for sail mine is presented. 大深度自主攻击水雷技术代表着现代水雷发展的必然趋势，为了适应这类水雷结构特点和发射要求，提出了一种航行雷箱体环形压雷梁开盖系统技术。
网络释义
mine jumbo mine rig 矿用钻车;
mine jumbo mine rig 矿用钻车;
Research and Analysis on Law of the Presentation of the Mine Pressure with Sub-level Caving Mining Working Face in Bao Yu Shan Coal Mine 宝雨山矿放顶煤工作面矿山压力显现规律研究与分析;
