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| 返矿平衡 | |||
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| 返矿平衡 | |||
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returns balance : 16 phrases in 7 subjects |
| Aviation | 1 |
| Electronics | 5 |
| Information technology | 1 |
| Metallurgy | 2 |
| Space | 1 |
| Technology | 1 |
| Telecommunications | 5 |
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