Quadratic function analysis of greatest subsidence angle during mining pitching or steerly pitching coal seam 大倾角煤层开采最大下沉角的二次插值分析
2.
Abstract : this article mainly introduces the preparation of petroleum pitch coal additive agent and the slurrying ability of coal on adding petroleum pitch 文摘:主要介绍了石油沥青水煤浆添加剂的制备和在煤中掺入石油沥青的制浆性能。
您当前位置：