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| Bessemer copper; blister copper; crude copper; raw blister copper; row copper | |||
| blister | |||
| black copper; raw copper | |||
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| blister copper | |||
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| crude blister copper | |||
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粗铜 : 24 phrases in 5 subjects |
| Computer numerical control | 1 |
| Construction | 1 |
| Mathematics | 1 |
| Metallurgy | 18 |
| Technology | 3 |
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