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| 主合同; 关键契约; 要约; 关键合同 | |||
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key contract : 9 phrases in 6 subjects |
| Animal husbandry | 2 |
| Bridge construction | 1 |
| Economy | 1 |
| Metallurgy | 3 |
| Project management | 1 |
| Technology | 1 |
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