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群延 时 : 39 phrases in 9 subjects |
| Air defense | 3 |
| Electric machinery | 1 |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Information technology | 6 |
| Piezoelectric crystals | 3 |
| Space | 6 |
| Technology | 12 |
| Telecommunications | 5 |
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