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换图 : 69 phrases in 11 subjects |
| Astronautics | 1 |
| Computers | 2 |
| Education | 1 |
| Electronics | 2 |
| General | 27 |
| Information technology | 1 |
| Mathematics | 2 |
| Microelectronics | 1 |
| Military | 4 |
| Radio | 1 |
| Technology | 27 |
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