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闭式的 : 20 phrases in 13 subjects |
| Agriculture | 2 |
| Aviation | 1 |
| Electric machinery | 1 |
| General | 4 |
| Management | 1 |
| Metallurgy | 2 |
| Plastics | 1 |
| Project management | 1 |
| Securities | 2 |
| Space | 1 |
| Technology | 2 |
| Telecommunications | 1 |
| Tennis | 1 |
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