mining g geodesy 矿山测量学

mining g compass 矿山罗盘 ; 矿山罗盘仪

mining g geology 矿山地质学 ; 采矿地质学

mining g truck 矿用卡车

advancing g mining 前进式开采

retreating g mining 后退式开采

heading g and bench mining 下向梯段式回采