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电弧光 : 46 phrases in 12 subjects |
| Agriculture | 1 |
| Aviation | 1 |
| Chemistry | 1 |
| Earth sciences | 1 |
| Electronics | 6 |
| General | 2 |
| Metallurgy | 6 |
| Oil / petroleum | 3 |
| Shipbuilding | 1 |
| Space | 4 |
| Technology | 17 |
| Telecommunications | 3 |
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