... barrel copper 手选块铜 barrier method 柱式开采法 bashing 封闭火灾区 ...
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... stoop and room 房柱式开采法 stoop method 柱式开采法 stoop system 柱式开采法 ...
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... stoop method 柱式开采法 stoop system 柱式开采法 stoop 安全煤柱 ...
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短语
房柱式开采法
board and pillar method
;
bord and wall method
;
heading and stall system
;
stoop and room
残柱式开采法
board and pillar mining method
-
pillar extraction
barrier method
barrier system
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