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| 拨号交换机指自动电话交换机 | |||
| 拨号交换机; 电话拨号自动交换机 | |||
| 自动电话交换机 | |||
| 自动交换区 | |||
| dial exchange: 4 phrases in 2 subjects |
| Electronics | 2 |
| Technology | 2 |
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