单项选择题

Packet-switching wireless networks are preferable(41)when transmissions are(42)because of the way charges are(43)per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are(44)for the(45)of time they use the net-work.

A.to
B.for
C.than
D.only
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单项选择题
For each blank, choose the best answer from the four choices and write down on the answer sheet.(11)is a protocol that a host uses to inform. a router when it joins Or leaves an Internet multicast group.(12)is an error detection code that most data communication networks use.(13)is an interior gateway protocol that uses a distance vector algorithm to propagate routing information.(14)is a transfer mode in which all types of information are organized into fixed form. cells on an asynchronous or non-periodic basis over a range of media.(15)is an identifier of a web page.
A.ICMP
B.SMTP
C.IGMP
D.ARP
单项选择题
信息工程是计算机信息系统发展的产物,形成了以(4)为中心的开发方法,以(5)的组织和实施来实现,并提供直到系统完成的各阶段的实施方法。
A.应用
B.程序
C.对象
D.数据
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