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| 连接层 | |||
| 链路层 | |||
| 数据链路层 | |||
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link layer : 35 phrases in 9 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Computer networks | 10 |
| Electronics | 7 |
| Information technology | 9 |
| Project management | 1 |
| Refrigeration | 1 |
| Space | 4 |
| Technology | 1 |
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