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【简答题】
( 15 分) 已知单极性 PAM信号 的带宽为 ,已调信号为 ; 为零均值窄带高斯噪声,功率谱密度为 。接收机如图所示, 为理想低通滤波器,带宽为 , 。 (1)、判断信号 是什么调制方式。( 3分) (2)、若 ,求滤波器 输出 的功率谱密度。( 4分) (3)、若 , ,求 的表达式。( 4分) (4)、若 , ,求抽样 的概率密度函数。( 4分)
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【单选题】All the students have to ______ to the rules and regulations of the school.
A.
confirm
B.
confront
C.
confine
D.
conform
【简答题】A．She will take the subway. B．She will hurry to the conference. C．She will skip the conference end go sightseeing. D．She will take a bus.
【单选题】An administrator attempts to create a link of /etc/db_conf to the target directory /db/v9.7/install/config. The following n?command failed toAn administrator attempts to create a link of /etc/db_conf ...
A.
-s flag to create a soft link
B.
-n flag to force create a hard link
C.
-N flag to force create a hard link
D.
-S flag to force create a soft link
【单选题】Which of the following statements is TRUE according to the news?
A.
Jabali told a press conference that Israeli army were responsible for the death of the two teenagers.
B.
An Israeli army spokesman told reporters that the two teenagers were sentenced to death by the Palestinian Authority.
C.
Jabali told reporters that the two teenagers were killed by Israeli soldiers when they were protesting at a death sentence handed down by the Israeli government against a local man for slaying an Israeli policeman.
D.
An Israeli police chief Jabali denied his men were responsible for the death of the two teenagers and instead blamed the Palestinian army.
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