Packet-switching wireless networks are preferable(71)when transmissions are(72)because of the way charges are(73)per packet.  Ci

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问题 Packet-switching wireless networks are preferable(71)when transmissions are(72)because of the way charges are(73)per packet.  Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are(74)for the(75)of time they use the network.

选项 A、long
B、short
C、large
D、small

答案B

解析
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