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激 发脉冲 : 24 phrases in 9 subjects |
| Air defense | 1 |
| Automated equipment | 1 |
| Aviation | 2 |
| Bridge construction | 1 |
| Electronics | 6 |
| General | 1 |
| Metallurgy | 4 |
| Space | 1 |
| Technology | 7 |
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