更多"Packet-switching wireless networks "的相关试题:
[单项选择]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