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| 本地电话交换机; 市话交换局 | |||
| 本地电话交换局 | |||
| 市内电话局 | |||
| 市话局; 本地交换局 | |||
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local telephone exchange : 5 phrases in 3 subjects |
| Electronics | 1 |
| General | 3 |
| Telecommunications | 1 |
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