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工艺 化学 : 27 phrases in 9 subjects |
| Agriculture | 1 |
| Aviation | 1 |
| Chemistry | 2 |
| Compressors | 1 |
| Electronics | 2 |
| Oil / petroleum | 3 |
| Space | 2 |
| Technology | 13 |
| Water resources | 2 |
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