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| 石油特许开采权 | |||
| 油气开采权 | |||
| 石油特许权; 石油租让权 | |||
| 石油开采权 | |||
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oil concession : 4 phrases in 3 subjects |
| Commerce | 1 |
| International trade | 2 |
| Technology | 1 |
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