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| alternating current/ direct current: 24 phrases in 11 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Business | 1 |
| Construction | 1 |
| Electric machinery | 1 |
| Electricity | 1 |
| Electronics | 3 |
| General | 2 |
| Geophysics | 1 |
| Project management | 1 |
| Technology | 10 |
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