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| 密 封 件: 55 phrases in 9 subjects |
| Aviation | 2 |
| Dentistry | 1 |
| Electronics | 14 |
| General | 15 |
| Nautical | 3 |
| Nuclear and fusion power | 2 |
| Nuclear physics | 1 |
| Refrigeration | 1 |
| Technology | 16 |
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