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电子微分器 : 16 phrases in 10 subjects |
| Aviation | 1 |
| Chemistry | 1 |
| Earth sciences | 3 |
| Ecology | 1 |
| Electronics | 1 |
| General | 2 |
| Oil processing plants | 1 |
| Space | 2 |
| Technology | 3 |
| Telecommunications | 1 |
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