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频率 发生器 : 32 phrases in 10 subjects |
| Air defense | 3 |
| Automated equipment | 1 |
| Aviation | 1 |
| Electric machinery | 1 |
| Electronics | 11 |
| Information technology | 1 |
| Metallurgy | 1 |
| Shipbuilding | 2 |
| Space | 1 |
| Technology | 10 |
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