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| 通信线回路操作 | |||
| 线路回路 | |||
| 线路环路; 电话用户线 | |||
| line loop: 36 phrases in 11 subjects |
| Architecture | 1 |
| Automobiles | 1 |
| Electronics | 7 |
| General | 1 |
| Information technology | 3 |
| Management | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 4 |
| Space | 1 |
| Technology | 12 |
| Telecommunications | 4 |
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