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| 卧式碳化炉; 平罐 | |||
| 横式罐; 卧式釜; 水平炭化炉; 水平罐 | |||
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horizontal retort : 6 phrases in 3 subjects |
| Metallurgy | 4 |
| Steel production | 1 |
| Technology | 1 |
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