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| 地层单位 | |||
| 地层单元; 分层单位; 地层分层单位 | |||
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| 地层单元; 分层单位; 地层分层单位 | |||
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stratigraphic unit : 33 phrases in 4 subjects |
| Drilling | 1 |
| Geology | 1 |
| Oil / petroleum | 11 |
| Technology | 20 |
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