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单压级 : 38 phrases in 10 subjects |
| Aviation | 1 |
| Compressors | 2 |
| Electronics | 2 |
| Metallurgy | 1 |
| Nautical | 2 |
| Oil / petroleum | 2 |
| Refrigeration | 5 |
| Space | 1 |
| Submarines | 1 |
| Technology | 21 |
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