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保持 : 20 phrases in 9 subjects |
| Automatic control | 3 |
| Electric motors | 3 |
| Electric traction | 1 |
| Electrical engineering | 1 |
| Electronics | 2 |
| Microsoft | 6 |
| Satellite communications | 1 |
| Thermal Energy | 2 |
| Vacuum tubes | 1 |
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