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混合密度 : 12 phrases in 9 subjects |
| Astronautics | 1 |
| Aviation | 1 |
| Electronics | 1 |
| Engineering geology | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 1 |
| Oil processing plants | 1 |
| Plastics | 1 |
| Technology | 2 |
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