[单选题]●在数据通信过程中，将模拟信号还原为数字信号的过程称为(29) 。(29)

正确答案 ：B

解调

[单选题]is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.(67)is a protocol that most USENET machines how use it to allow news articles to propagate from one machine to another over a reliable connection.(68)is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable.(69)is a device used to connect two separate network that use different communication protocol.(70)js a digital

正确答案 ：A

MD

解析：解析：本题主要考查加密理论中的消息摘要(messagedigest)的简写MD。答案为A。

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