Underground Coal Mine短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 地下煤矿 The development trend of scraper conveyor used at working face of underground coal mine overseas is to have greater driving power. 国外用于采煤工作面的刮板输送机的发展趋势是加大驱动功率。 cnki This paper demonstrates the optimization of the nearly flat seam underground coal mine planning by the multi- objective decision-making method. 文章采用多目标决策法进行近水平煤层矿井设计的最优化。 cnki