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| 冷加工铜; 硬铜 | |||
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hard copper : 18 phrases in 9 subjects |
| Aviation | 2 |
| Business | 1 |
| Electric machinery | 3 |
| Electronics | 1 |
| General | 2 |
| Metallurgy | 3 |
| Rail transport | 2 |
| Technology | 2 |
| Telecommunications | 2 |
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