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观 : 89 phrases in 13 subjects |
| Accumulators | 1 |
| Automatic control | 3 |
| Electric motors | 1 |
| Electrical engineering | 1 |
| Electronics | 4 |
| Environment | 26 |
| General | 29 |
| Isolation | 1 |
| Mathematics | 13 |
| Physics | 4 |
| Statistics | 3 |
| Thermal Energy | 2 |
| Welding | 1 |
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