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| 电压火花: 28 phrases in 10 subjects |
| Automobiles | 7 |
| Aviation | 1 |
| Electronics | 4 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geophysics | 1 |
| Information technology | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 2 |
| Racing and motorsport | 2 |
| Technology | 6 |
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