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● Traditional Internet access methods like dial-up were so slow that host computers were connected to the dial-up (71) at the customer premise over slow (72) ports. PPP was designed to run directly over these serial links. But with the advent of broadband Internet (73) technologies such as ADSL and cable modems there has been a considerable increase in the bandwidth delivered to the end users. This means that the host computers at the customer premise connect to the (74) or cable "modem" over a much faster medium such as Ethernet. It also means that multiple (75) can connect to the Internet through the same connection.

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● 以下控制流程图的环路复杂性V(G)等于(54) 。
(54) A.4 B.5 C.6 D.1

(28 )基于下列 关系 R 、 S 和 T 的操作中 , 哪一个是正确的 ?

● 主板(也称母板或系统板)是计算机硬件系统集中管理的核心载体,几乎集中了全部系统功能,是计算机中的重要部件之一。下图所示的微机主板上,①处是 (21) ,②处是 (22) 。

● 如下图所示,设置Windows的本地安全策略,能够(55)
(55)

A. 使计算机闲置30分钟后自动处于锁定状态
B. 使计算机闲置60分钟后自动处于锁定状态
C. 使计算机在5次无效登录后锁定30分钟,然后才允许新的登录操作
D. 使计算机在5次无效登录后锁定60分钟,然后才允许新的登录操作

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