从狭义来讲,NGN特指以()设备为控制中心,能够实现业务与控制、接入与承载相分离各功 发布时间:2017-06-26 23:37 │ 来源:www.tikuol.com 题型:单项选择题 问题: 从狭义来讲,NGN特指以()设备为控制中心,能够实现业务与控制、接入与承载相分离各功能部件之间采用标准的协议进行互通。A.多业务传送平台B.软交换C.智能光网络D.无源光网络
题型:单项选择题 Tom does speak Chinese well, but his reading and writing skills leave much ______. [ ]A. to improve B. to be improved C. being improved D. having improved 查看答案
题型:单项选择题 SQL语言中,能正确实现级联删除的命令是( )。A.ON DELETE CASCADESB.ON DELETE RESTRICTEDC.ON DELETE NULLIFIESD.ON DELETE DEFAULT 查看答案