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偏 微 分方程 : 26 phrases in 12 subjects |
| Aviation | 2 |
| Business | 3 |
| Earth sciences | 2 |
| Electronics | 2 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 2 |
| Geophysics | 1 |
| Mathematics | 1 |
| Oil / petroleum | 2 |
| Space | 1 |
| Technology | 8 |
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