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分层度 : 22 phrases in 11 subjects |
| Aerodynamics | 1 |
| Chemistry | 1 |
| Electronics | 1 |
| General | 4 |
| Geology | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Oil and gas | 2 |
| Oil processing plants | 1 |
| Radio | 1 |
| Technology | 7 |
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