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| 信令链路 | |||
| 信令链 | |||
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signaling link test : 56 phrases in 7 subjects |
| Air defense | 1 |
| Aviation | 3 |
| Computer networks | 5 |
| Electronics | 14 |
| Information technology | 4 |
| Technology | 2 |
| Telecommunications | 27 |
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