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| 国际电报电话咨询委员会7号信令 | |||
| 国际电报电话咨询委员会 7 号信令 | |||
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| 七号信令; CCITT No.7 信令 | |||
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CCITT No.7 signaling : 2 phrases in 1 subject |
| Electronics | 2 |
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