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| 导数的阶 | |||
| 导数阶; 微分阶 | |||
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derivative order : 18 phrases in 7 subjects |
| Agriculture | 1 |
| Oil / petroleum | 3 |
| Space | 1 |
| Technology | 9 |
| Telecommunications | 2 |
| United Nations | 1 |
| Water resources | 1 |
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