board and pillar method

同义词释义

1)board and pillar method,房柱式开采法2)board and wall method,房柱式开采法3)bord and pillar method,房柱式开采法4)bord and wall method,房柱式开采法5)heading and stall method,房柱式开采法6)heading and stall system,房柱式开采法7)stall and breast method,房柱式开采法8)stoop and room,房柱式开采法9)stoop and room system,房柱式开采法10)room and pillar,房柱