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1.x[n]*u[n]=x[n]。( )
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2. 设u=u(r),r=√x x … x,n≥3,若u满足
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3.有限长序列x(n)满足x(n)=x(N−n),则其DFT X(k)满足( )。
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4.lín xún
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5.diàn xìn
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6.zūn xún táo zuì wēī é chōnɡ jǐnɡ lǎn duò shèn tòu
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7.设集合P={x 1-1≤x≤3),N={x1 2≤x≤4),则P U N是 ()
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8.函数A、y = u n , u =cos x nB、y = t , t =cos n xC、y = t n , t =cos xD、y =cos t , t = x n
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9.Given signal x[n]={1.1,1,1,1} and y[n]=n+1 (0≤n≤2), then the linear convolution of x[n] and y[n] is (
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10.xún cháng