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| 21. | reducing smelting |
| 还原冶炼 |
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| 22. | pressure reduction |
| 加压还原 |
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| 23. | vat blue RSN |
| 还原蓝 |
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| 24. | photochemical reduction |
| 光化还原 |
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| 25. | indirect reduction |
| 间接还原 |
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| 26. | incomplete reduction |
| 不完全还原 |
|
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| 27. | sulfate reduction |
| 硫酸还原 |
|
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| 28. | magnesium reduction |
| 镁还原 |
|
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| 29. | electrolytic reduction |
| 电解还原 |
|
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| 30. | photographic reproduction |
| 光学还原 |
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