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| 31. | differentiating stage |
| 微分级 |
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| 32. | interrupted aging |
| 分级时效 |
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| 33. | classification clause |
| 分级条款 |
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| 34. | ore classification |
| 矿石分级 |
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| 35. | combustibility classification |
| 燃烧性分级 |
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| 36. | fractional volatilization |
| 分级挥发 |
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| 37. | fractional stimulation |
| 分级刺激 |
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| 38. | preparation of sized raw coal |
| 分级入选 |
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| 39. | fractional turn |
| 分级转动 |
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| 40. | nization by step |
| 分级电离 |
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