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| letter key | |||
| 字 母 键: 19 phrases in 9 subjects |
| Aviation | 1 |
| Electronics | 3 |
| Information technology | 3 |
| Multimedia | 1 |
| Oil / petroleum | 1 |
| Space | 1 |
| Technology | 1 |
| Telecommunications | 7 |
| Textile industry | 1 |
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