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精确 图 : 14 phrases in 9 subjects |
| Aviation | 1 |
| Computers | 1 |
| Electronics | 1 |
| General | 1 |
| Metallurgy | 1 |
| Shipbuilding | 2 |
| Space | 1 |
| Technology | 5 |
| Telecommunications | 1 |
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