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| метод рафинирования; кричный способ | |||
| метод очистки | |||
| процесс рафинирования | |||
| метод аффинажа (贵金属的) | |||
| 精炼法: 35 phrases in 3 subjects |
| General | 24 |
| Metallurgy | 4 |
| Technology | 7 |
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