题型:多项选择题 报文交换的特点有()。A.给用户提供了完全“透明”的信号通路B.没有电路的接续过程,一条链路可进行多路复用,从而大大提高了链路的利用率C.实时性较好D.不需要收、发两端同时处于激活状态E.对设备要求较高 查看答案
题型:单项选择题 Soon, more of the information we receive via the Internet could come (6) in digital wrappers. Wrappers are made up (7) software code that’s targeted to do specific things with the data (8) within them, such as helping to define queries for search engines. They also keep (9) from (10) access to that code.A.ofB.offC.onD.out 查看答案