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| 产油层 | |||
| 有效报酬; 有效产层 | |||
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effective pay : 14 phrases in 8 subjects |
| Drilling | 1 |
| Economy | 1 |
| Finances | 1 |
| Geology | 2 |
| International trade | 1 |
| Mining | 2 |
| Oil / petroleum | 2 |
| Technology | 4 |
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