Nobody had predicted the scale of impact of （ ） communications and that it world be one of the largest businesses in the history of mankind with and immense impact on all economies.[1分]
A.microwave
B.satellite
C.cell
D.cellular
参考答案
立即搜索
您可能感兴趣的试题
Deploying enhanced broadband services over existing network infrastructure （ ）in increase of the network complexity and therefore,extra expenses on network management and maintenanc
The approaching 4G mobile communication systems are projected to （ ） still remaining problems of 3G systems and to provide （ ） new services ,from high-quality voice to high-definition video to high data-rate wireless channels.