【单选题】数字信号和模拟信号的特点是( )。
A.
模拟信号大小上、时间上均不连续,数字信号则相反
B.
数字信号大小上、时间上均不连续,模拟信号则相反
【简答题】电子学研究的对象是载有信号的电信号,按其特点可以分为模拟信号和数字信号。模拟信号的特点是 ,数字信号的特点是 。
【单选题】We ______ any money at that time.
【简答题】数字信号的特点是 ,模拟信号的特点是 。
【单选题】They didn't watch the TV play that day, and______.
【单选题】We used to have a discussion, ___?
【简答题】We didn’t go fishing because it rained heavily.(改为同义句) We didn’t go fishing________ ________ the heavy rain.