综合反映数字电视所有相位、幅度类型失真的指标,类似于模拟系统中的信号噪声比(S/N)的是()。
A、MER
B、BER
C、EVM
D、以上都不是
参考答案:A
用所给词的适当形式填空。(10分)X|k |B | 1 . c |O |m
小题1:Doctor Wang always spends a lot of time ________(解释)things to us.
小题2:I am (terrible) sorry that I’m late again.
小题3:It’s_______(correct) to walk across the road when the lights are red.
小题4:I will never forget the ________(经历).during the last summer camp.They were so wonderful.
小题5:He is sure there is no ________(hide) meaning in this article.
小题6:The little boy stood ________(紧靠) the wall.
小题7:This kind of novels were popular at the end of the ________(ninety) century.
小题8:It’s unhealthy for us to stay in the ________(pollute) air like this.
小题9:The air is much________(新鲜 )after the government has taken actions.
小题10:We heard a whisper from the ________(dark).We felt very afraid.
各家电影公司竞相建立自己的网站以宣传和展示其拍摄的影片,这已经成为国际互联网上最新的趋势。www.mca.com是()公司的网址。
A.八一电影制片厂
B.上海电影制片厂
C.环球电影公司
D.派拉蒙电影公司