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【单选题】
下列对 IIR 滤波器特点的论述中错误的是 ( )A.
系统的单位冲激响应 h(n) 是无限长的
B.
结构必是递的
C.
肯定是稳定的
D.
系统函数 H(z) 在有限 z 平面（ 0 ∞）上有极点
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举一反三
【简答题】请写出以下程序的运行结果 #include"stdio.h" int fun(int x,int y) { return(x-y); } main() { int a=2,b=3,c=8; int x,y; x=fun(a+c,b); y=fun(x,a-c); printf("%5d\n",y); }
【简答题】阅读理解。 Once upon a time, there lived a rich man. He had a servant (仆人). He and the servant(仆人) loved wine and good food very much. Each time the rich man left his home, the servant would drink the wine...
【简答题】阅读理解 Jane Good all first made friends with a chimp (黑猩猩) when she was one year old. On her first birthday her mother carried her to the zoo near her home and bought her a toy chimp. She loved her furr...
【简答题】阅读理解。 Once upon a time, there lived a rich man. He had a servant (仆人). He and the servant loved wine (酒) and good food very much. Each time the rich man left his home, the servant would drink the wine...
【简答题】阅读理解。 Once upon a time, there lived a rich man. He had a servant (仆人). He and the servant loved wine and good food very much.. Each time the rich man left his home, the servant would drink the wine an...
【单选题】 要把屏幕内容复制到剪贴板中(截屏),可按( )。
A.
"Alt+PrintScreen"
B.
"Shift+PrintScreen"
C.
"PrintScreen"
D.
"Ctrl+PrintScreen"
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