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| 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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