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辅助 实验 : 16 phrases in 9 subjects |
| Aviation | 2 |
| Earth sciences | 3 |
| Electronics | 3 |
| General | 2 |
| Geology | 1 |
| Metallurgy | 1 |
| Patents | 1 |
| Technology | 2 |
| Telecommunications | 1 |
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