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光学 子系 统 : 24 phrases in 9 subjects |
| Automobiles | 1 |
| Aviation | 7 |
| Earth sciences | 2 |
| Electronics | 4 |
| General | 2 |
| Metallurgy | 1 |
| Space | 2 |
| Technology | 4 |
| Telecommunications | 1 |
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