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| surface oxidation treatment (【技】 通过对钢制品表面进行化学处理，使其表面生成蓝灰色、黑色、褐色等保护性氧化膜的表面处理。也叫做发蓝、发黑处理。) | |||
| 表面氧化处理: 5 phrases in 2 subjects |
| Automobiles | 1 |
| Metallurgy | 4 |
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