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| protocol data unit | |||
| 协议数据 单元: 64 phrases in 9 subjects |
| Artificial intelligence | 2 |
| Aviation | 1 |
| Electronics | 33 |
| Information technology | 5 |
| Multimedia | 1 |
| Project management | 1 |
| Space | 4 |
| Technology | 3 |
| Telecommunications | 14 |
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