Packet-switching wireless networks are preferable(41)when transmissions are(42)because of the way charges are(43)per packet. Cir

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问题 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.

选项 A、point
B、start
C、length
D、end

答案C

解析 由于是按照每个包来收费的,仅仅当传送的消息比较短的时候,使用分组交换无线网络更好一些;当传送大的文件或者长的传送消息的时候,电路交换更优越一些,因为客户是根据他们所使用的网络的时间长短来交费的。
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