搜题请搜索小程序“爱下问搜题”
问题 单项选择题

系统软件一般包括( )。
Ⅰ．服务性程序 Ⅱ．语言处理程序
Ⅲ．操作系统 Ⅳ．数据库管理系统

A．Ⅰ、Ⅱ和Ⅲ
B．Ⅰ、Ⅲ和Ⅳ
C．Ⅱ、Ⅲ和Ⅳ
D．全部

答案

参考答案：D

单项选择题

(66) 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-to-digital polar encoding method in which the signal level is always either positive or negative.

A．ADSL

B．FTTC

C．HFC

D．FTTH
查看答案
填空题

“飞雪连天射白鹿，笑书神侠倚碧鸳”共说了（）本书。
查看答案