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| 交換網 (A communications network that uses switching to establish a connection between parties, such as the dial-up telephone system) | |||
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| 公衆交換電話網PSTN | |||
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switched network : 6 do fraz, 3 tematyki |
| Microsoftu | 1 |
| Radiokomunikacja i radiotechnika | 1 |
| Telekomunikacja | 4 |