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| 椭圆-圆-椭圆孔型系统设计; 椭圆-圆-椭圆孔型系统轧制法; 椭圆-圆-椭圆孔型系统设计法 | |||
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oval- round -oval method : 5 phrases in 2 subjects |
| General | 1 |
| Metallurgy | 4 |
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