这些电路对实现一个城市电话通信网或本地通信网的全自动化接续，具有一定参考价值。
These interface circuits which realize the automatic connection of the local communication networks have a consultive value.
这些电路对实现一个城市电话通信网或本地通信网的全自动化接续，具有一定参考价值。
These interface circuits which realize the automatic connection of the local communication networks have a consultive value.
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