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| 基准钻孔; 构造钻孔; 绘制地层图用钻孔 | |||
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| 基准钻孔; 构造钻孔; 绘制地层图用钻孔 | |||
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stratigraphical hole : 4 phrases in 2 subjects |
| Oil / petroleum | 1 |
| Technology | 3 |
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