For (1) service, we need a virtual-circuit subnet. Let us s

【名词&注释】

路由器(router)、数据包(packet)、氯化物(chloride)、重要因素(important factors)、相结合(combination)、一部分(part)、负电荷(negative charge)、标识符(identifier)、人工合成的(a synthetic)、正电荷(positive charge)

[单选题]For (1) service, we need a virtual-circuit subnet. Let us see how that works. The idea behind virtual circuits is to avoid having to choose a new (2) for every packet sent. Instead,when a connection is established, a route from the(3) machine to the destination machine is chosen as part of the connection setup and stored in tables inside the (4) . That route is used for all traffic flowing over the connection, exactly the same way that the telephone system works.When the connection is released, the virtual circuit is also terminated. With connection-oriented service, each packet carries an (5) telling which virtual circuit it belongs to.

A. B

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[单选题]公司WWW展示的一个重要因素是（）

A. 同顾客建立联系
B. 同潜在顾客建立联系
C. 同顾客或潜在顾客建立联系
D. 目标受众识别

[单选题]急性湿疹如果去除致病因素并积极合适治疗，患者一般痊愈时间是（）

A. 一个月
B. 两个月
C. 三个月
D. 四个月
E. 五个月

[单选题]碱性染料电离后，显色基团带电荷性质为（）

A. 带正电荷^{(positive charge)}
B. 带负电荷^{(negative charge)}
C. 不带电荷
D. 带正负电荷^{(negative charge)}
E. 带正电荷^{(positive charge)}，电离后带负电荷^{(negative charge)}

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