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| through in laboratory.Through this e | |
| 作者姓名： | xperi |
| 作者单位： | mentation，it indicates that the sam |
| 摘 要： | most fragmentized strata.karst strata;through-type DTH hammer reverse circulation bit;water well drilling;bit block0施工技术Construction Technology94-96P6 |
| 关 键 词： | pling bit added pumping hole adapts to drilling in |
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