题目内容
（请给出正确答案）
[主观题]
A．one communication method without integrationB．development of new telecommunications equi
A．one communication method without integration
B．development of new telecommunications equipment
C．the brain of the next generation network
D．his particular assigned number
E．different devices and media
F．transformation of old circuit based networks
It is not so convenient to use only______
答案
查看答案
