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信令数据链路
| 级
| 信令数据链路 | |
| tech. | signalling data link |
| B3 级 | |
| IT | B3 class |
| 级 | |
| gen. | grade; rank |
| econ. | hierarchy |
| hydroel.st. | stage |
| interntl.trade. | Aaa |
| |||
| signalling data link | |||
| signaling data link | |||
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信令数据链路 : 6 phrases in 3 subjects |
| Computer networks | 1 |
| Electronics | 1 |
| Telecommunications | 4 |
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