This provides useful information on the type of occurrences.所有资料提供有关矿床类型的有价值材料.The latter studies are extremely useful to the analyst.后者的这些研究对于分析工作者极为有用.Combinatorial Theory is exceptionally useful in the real world.组合论在...
Distribution and transfusion of the geostatic pressure variate in company with mining space in underground mining.地下开采中地压分布与转移随开采空间变动而变动,不同的开采顺序会带来不同的围岩稳定性....