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光 单 元 : 65 phrases in 13 subjects |
| Air defense | 2 |
| Aviation | 4 |
| Communications | 3 |
| Electronics | 29 |
| General | 2 |
| Information technology | 8 |
| Nautical | 1 |
| Oil / petroleum | 1 |
| Solar power | 1 |
| Space | 2 |
| Sports | 3 |
| Technology | 7 |
| Telecommunications | 2 |
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