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双 基的 : 14 phrases in 9 subjects |
| Air defense | 3 |
| Animal husbandry | 1 |
| Business | 1 |
| China | 1 |
| Electronics | 2 |
| General | 1 |
| Plastics | 2 |
| Shipbuilding | 1 |
| Technology | 2 |
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