digital program controlled exchanging
digital program controlled exchanging
数字程控交换机
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The telephone network based on circuit-switching and digital program controlled exchanging technology plays an important role in the whole communicating networks.
以电路交换和数字程控交换技术为基础的电话网更是在整个通信网中占据着重要的地位。
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