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实验处理 : 31 phrases in 11 subjects |
| Aviation | 2 |
| Business | 1 |
| Earth sciences | 5 |
| Electronics | 8 |
| General | 1 |
| Metallurgy | 1 |
| Space | 4 |
| Technology | 5 |
| Telecommunications | 2 |
| United States | 1 |
| Wind Energy | 1 |
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