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| 51. | pressure reduction |
| 加压还原 |
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| 52. | " Methods for chemical analysis of iron, steel and alloy-The reducing distillation-methylene blue photometric |
| GB/T223.67-1989钢铁及合金化学分析方法还原蒸馏-次甲基蓝光度法测定硫量 |
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| 53. | vat blue RSN |
| 还原蓝 |
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| 54. | photochemical reduction |
| 光化还原 |
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| 55. | indirect reduction |
| 间接还原 |
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| 56. | incomplete reduction |
| 不完全还原 |
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| 57. | sulfate reduction |
| 硫酸还原 |
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| 58. | magnesium reduction |
| 镁还原 |
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| 59. | electrolytic reduction |
| 电解还原 |
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| 60. | photographic reproduction |
| 光学还原 |
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