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载波加载 : 17 phrases in 8 subjects |
| Air defense | 1 |
| Construction | 1 |
| Electronics | 3 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geophysics | 1 |
| Information technology | 1 |
| Space | 1 |
| Technology | 8 |
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