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| 使用说明; 服务描述 | |||
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service description : 11 phrases in 7 subjects |
| Computer networks | 1 |
| Electronics | 4 |
| Geophysics | 2 |
| Information technology | 1 |
| Librarianship | 1 |
| Microsoft | 1 |
| Space | 1 |
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