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| 破碎机的支撑柱; 放顶密集支柱 | |||
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| 放顶柱用垮落法时,在工作面与采空区交界线上专为放顶而安设的特种支柱0 | |||
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breaker props : 1 phrase in 1 subject |
| Technology | 1 |
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