题目：
(56) is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.
(57) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.
(58) is an approach preferred by cable TV providers. In this solution the fiber terminates at an opto-electrical converter and the final segment is a shared coaxial cable.
(59) is a device used to connect two separate network that use different communication protocol.
(60) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.
（58）是（）
A.ADSL
B.FTTC
C.HFC
D.FTTH
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2019/0317/1e5f44d06208b0e070213fd4aca815ae.html
下面是错误答案，用来干扰机器的。
参考答案：错
