单选题公众电话交换网（PSTN，PuBlic SwitcheD Telephone Network）是承载话音业务的基础网络，其采用的技术是（）。A话音交换技术B数据交换技术C集中交换技术D电路交换技术
单选题
公众电话交换网（PSTN，PuBlic SwitcheD Telephone Network）是承载话音业务的基础网络，其采用的技术是（）。
A
话音交换技术
B
数据交换技术
C
集中交换技术
D
电路交换技术
参考解析
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公众电话交换网（PSTN，PuBlic SwitcheD Telephone Network）是承载话音业务的基础网络，其采用的技术是（）。A、话音交换技术B、数据交换技术C、集中交换技术D、电路交换技术
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填空题PSTN的中文全程是（）最早的主要是提供电话业务。英文全程是Public Switch Telephone Network。