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【简答题】
从矩阵A中抽取主对角线的元素作为的命令是__________
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【简答题】One night, I 小题1: (listen) to music in my room when there was a knock on the door, then I heard a voice “Would you mind my 小题2: (come) in?”I turned down the CD player. Then I said,“Come in, please!”It...
【多选题】如果随机过程X(t)是广义平稳的,那么它一定具有_______特点。
A.
自相关函数与时间起点无关
B.
满足各态历经的性质
C.
严格平稳
D.
均值是常数
E.
自相关函数与时间间隔有关
【简答题】Then, one night, he announced to the world that I was his girlfriend and promised to marry me and become a lawyer. Though I ________with him, I was certain that I would never marry this guy, a _____ w...
【简答题】Peter was a potter (制陶工). He had a wife and two fine sons. One night, his older son got a stomachache. At first, Peter and his wife thought the boy just got a bad cold, so they didn’t take it . But it...
【简答题】Pirate's Treasure "Ten steps from the porch and twenty steps from the rose bushes," growled Bluebeard in Jimmy's dream one night. "There be treasure there! Aawrgh." So the next day Jimmy began to dig....
【简答题】One night a young American doctor was sleeping at home when his doorbell began to ring. When he opened the door he saw a man 36 outside. “Excuse me, Doctor,”said the man. “Can you come at once to a p...
【单选题】通信中遇到的随机过程大多是广义平稳随机过程,判断广义平稳的条件是
A.
n维概率密度函数与时间起点无关
B.
n维概率密度函数与时间起点有关
C.
方差是常数，自相关函数与时间起点有关
D.
数学期望是常数，自相关函数只与时间间隔有关
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