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| 信号交换 | |||
| 回复; 给回执; 开收据 | |||
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| 校验返回信号 | |||
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квитирование : 12 phrases in 6 subjects |
| Computers | 3 |
| Electronics | 3 |
| General | 1 |
| Information technology | 2 |
| Security systems | 1 |
| Technology | 2 |
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