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微 分阶 : 26 phrases in 10 subjects |
| Air defense | 2 |
| Aviation | 1 |
| Bridge construction | 2 |
| Business | 3 |
| Electronics | 2 |
| General | 2 |
| Mathematics | 1 |
| Space | 4 |
| Technology | 8 |
| Wind Energy | 1 |
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