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| 30 路或 24 路 PCM 制式; 30 路/24 路 PCM 制式转换 | |||
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| 30 路或 24 路 PCM 制式; 30 路/24路 PCM 制式转换 | |||
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E-1/T-1 : 5 phrases in 1 subject |
| Telecommunications | 5 |
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