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| 地层气 | |||
| formation gas: 32 phrases in 13 subjects |
| Agriculture | 1 |
| Automobiles | 2 |
| Electric machinery | 1 |
| Electronics | 1 |
| Engineering geology | 1 |
| Geology | 1 |
| Isolation | 1 |
| Metallurgy | 3 |
| Mining | 3 |
| Oil / petroleum | 4 |
| Plastics | 3 |
| Space | 1 |
| Technology | 10 |
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