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直流电极 : 24 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Earth sciences | 1 |
| Electric machinery | 4 |
| Electronics | 2 |
| Hydroelectric power stations | 2 |
| Metallurgy | 4 |
| Radio | 1 |
| Technology | 7 |
| Telecommunications | 1 |
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