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分层 分析 : 38 phrases in 11 subjects |
| Chemistry | 1 |
| Electronics | 2 |
| Energy industry | 1 |
| Food service and catering | 1 |
| General | 11 |
| Geology | 3 |
| Mathematics | 1 |
| Medical | 3 |
| Oil / petroleum | 1 |
| Physics | 4 |
| Technology | 10 |
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