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化学 净 化 : 30 phrases in 12 subjects |
| Agriculture | 1 |
| Earth sciences | 3 |
| Ecology | 3 |
| Electric machinery | 1 |
| Electronics | 3 |
| Environment | 1 |
| General | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Shipbuilding | 2 |
| Technology | 11 |
| Water resources | 1 |
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