Taking gas control of workface as example, this paper introduces high break exhaust roadway, coal seam driling pre - exhanst and exhaust of coal seam end roadway,comprehansive method control gas.是什么意思_Taking gas control of workface as example, this paper introduces high break exhaust roadway, coal seam driling pre - exhanst and exhaust of coal seam end roadway,comprehansive method control gas.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句