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最小 控制 : 33 phrases in 9 subjects |
| Aviation | 17 |
| Earth sciences | 1 |
| Electronics | 2 |
| International trade | 1 |
| Management | 1 |
| Metallurgy | 3 |
| Refrigeration | 1 |
| Space | 4 |
| Technology | 3 |
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