is the sending and receiving of the messages by computer. It

【名词&注释】

全世界(worldwide)、信息网络(information network)

[单选题]is the sending and receiving of the messages by computer. It is a fast, low-cost way of communicating worldwidE..

A. LAN
B. Post office
C. E-Mail
D. Interface

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[单选题]●Communication networks can be classified in terms of their physical arrangement or (73) Three common (73) are the star,bus,and ring.(73)

A. structures
B. topologies
C. protocols
D. frames

[单选题]在需要经常查找结点的前驱与后继的场合中，使用(40)比较合适。

A. 单链表
B. 循环链表
C. 链栈
D. 双链表

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