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| bull's eye; electrode port (①The center section of the roof which surrounds the electrode ports is called the roof delta and is a cast section of refractory which may be water cooled. 环绕电极孔的炉顶中心区称为炉顶三角区，由耐火材料浇筑而成并可以进行水冷。② In some cases the slag is foamed to such an extent that it comes out of the electrode ports. 有时炉渣起泡甚至溢出电极孔。) | |||
| electrode hole | |||
| 电极孔: 15 phrases in 5 subjects |
| Electronics | 4 |
| General | 1 |
| Metallurgy | 6 |
| Space | 1 |
| Technology | 3 |
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