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| 游离灰分 | |||
| free ash: 44 phrases in 12 subjects |
| Agriculture | 2 |
| Architecture | 1 |
| Chemistry | 1 |
| Desert science | 1 |
| Earth sciences | 8 |
| Electronics | 1 |
| General | 4 |
| Metallurgy | 8 |
| Oil / petroleum | 1 |
| Oil processing plants | 2 |
| Polymers | 2 |
| Technology | 13 |
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