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复反应 : 23 phrases in 10 subjects |
| Chemistry | 3 |
| Construction | 2 |
| Electronics | 3 |
| General | 4 |
| Mathematics | 2 |
| Medical | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Quality control and standards | 1 |
| Technology | 5 |
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