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| 霍尔电解炼铝法 | |||
| 霍尔球磨制粉法 | |||
| 霍尔方法; 电解还原制铝法 | |||
| Hall process: 6 phrases in 4 subjects |
| Business | 1 |
| Electronics | 1 |
| Metallurgy | 3 |
| Steel production | 1 |
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