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| 未下套管的井 | |||
| 未下套管的井〔钻孔〕 | |||
| 裸眼; 未下套管井眼 | |||
| 无套管钻孔; 未下套管钻孔; 无井管孔 | |||
| uncased hole: 1 phrase in 1 subject |
| Engineering geology | 1 |
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