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| 贝氏酸性转炉钢 | |||
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| 酸性贝塞麦转炉钢; 酸性转炉钢 | |||
| 贝氏酸性钢 | |||
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Bessemer Acid Steel : 2 phrases in 1 subject |
| Metallurgy | 2 |
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