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| four wire system | |||
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| 四线制: 28 phrases in 10 subjects |
| Aviation | 1 |
| Electronics | 3 |
| Handball | 1 |
| Hydroelectric power stations | 1 |
| Information technology | 3 |
| Mathematics | 1 |
| Metallurgy | 3 |
| Rail transport | 1 |
| Space | 2 |
| Technology | 12 |
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