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| 电话交换网 | |||
| 电话交换网络 | |||
| 交换式电话网 | |||
| 交换电话网络 | |||
| switched telephone network: 23 phrases in 10 subjects |
| Aviation | 1 |
| Communications | 1 |
| Computer networks | 1 |
| Data processing | 2 |
| Electronics | 6 |
| Information technology | 5 |
| Multimedia | 2 |
| Nautical | 1 |
| Space | 1 |
| Technology | 3 |
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