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°®ÓëÓêÏÂ(½ð±Ò+1): 2011-10-30 20:23:41
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°®ÓëÓêÏÂ(½ð±Ò+1): 2011-10-30 20:23:41
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| Variation of the supporting pressures under different distances of propelling the working face |

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