coal pillar and supporting parameter的意思|示意
美 / /
英 / /
煤柱及支护参数
coal pillar and supporting parameter的网络常见释义
煤柱和支护参数 ...煤柱和支护参数；控制底鼓 [gap=415]Key words: coal face; road driving along goaf; reasonable design; coal pillar and supporting parameter; floor lift control ..