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underhand work
tech.
下向梯段凿岩
;
下向梯段开挖
;
下向梯段掘进
;
下向梯段回采
;
下向采掘
;
正台阶式凿岩
;
正台阶式开挖
;
正台阶式掘进
;
正台阶式回采
;
俯采式凿岩
;
俯采式开挖
;
俯采式掘进
;
俯采式回采
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