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字母数字 字符 : 16 phrases in 9 subjects |
| Advertising | 2 |
| Air defense | 1 |
| Aviation | 1 |
| General | 4 |
| Information technology | 1 |
| Metallurgy | 1 |
| Multimedia | 1 |
| Project management | 1 |
| Technology | 4 |
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