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| 中空钢; 钎子钢 | |||
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cored steel : 27 phrases in 8 subjects |
| Architecture | 2 |
| Communications | 1 |
| Electronics | 1 |
| General | 3 |
| Geophysics | 1 |
| Metallurgy | 6 |
| Rail transport | 1 |
| Technology | 12 |
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