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| 社区自动交换 | |||
| 小区电话自动交换局 | |||
| 乡村自动电话局 | |||
| 公用自动交换机; 公用自动电话交换; 区内自动电话局 | |||
| 社区自动交换局; 县［区; 乡; 镇］自动交换局 | |||
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