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| 封闭气孔; 闭口气孔; 封闭气孔 | |||
| 封闭孔; 闭气孔; 闭口气孔; 闭口孔 | |||
| closed pore: 3 phrases in 2 subjects |
| Metallurgy | 2 |
| Technology | 1 |
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