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| 初次氧化皮 (加热时形成的); 一次氧化皮 | |||
| 初生氧化铁皮 | |||
| 主要比例 (尺); 基本比例 (尺) | |||
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primary scale : 5 phrases in 2 subjects |
| Metallurgy | 4 |
| Technology | 1 |
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