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氢氧 气 : 18 phrases in 9 subjects |
| Astronautics | 1 |
| Chemistry | 1 |
| Electronics | 1 |
| General | 6 |
| Medical | 1 |
| Oil / petroleum | 2 |
| Oil processing plants | 2 |
| Scuba diving | 1 |
| Technology | 3 |
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