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| 含气指数 | |||
| 天然气指数 | |||
| gas index: 11 phrases in 7 subjects |
| Finances | 1 |
| Geology | 1 |
| Geophysics | 3 |
| Mining | 2 |
| Nursing | 1 |
| Sports | 1 |
| Technology | 2 |
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