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1.在K系辐射线中Kα2波长比Kα1的长
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2.A.K 3 = K 1 - K 2B.K 3 =( K 1 / K 2 )C.K 3 =( K 1 / K 2 ) 2D.K 3 = K 1 -2 K 2
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3.k=10000while k>1: print(k) k=k/2
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4.If the type of k is int, what is the number of iterations of the following while loop?
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5.若k为整形, 下述while循环执行的次数为 k=1000 while k>1: print(k) k = k/2
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6.若方程为: y(k) – y(k –1) – 2y(k –2)=f(k) – f(k – 2) 求单位序列响应h(k),单位阶跃响应 g(k)
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7.已知序列x1[k]=[3,1,1], k=0,1,2 x2[k]=[1,2,1,-1],k=0,1,2,3 计算x[k]=x1[k]*x2[k],则x[2]等于( )
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8.如果kxA、-1≤k≤0B、-1≤k<0C、-1<k≤0D、-1<k<0
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9.1、已知序列x[k] = { 1,2, 3 ; k = 0, 1, 2},y[k] = { 1, 1, 2 ; k = 0, 1, 2},(1)试计算序列x[k]的自相关函数Rx[n],以及序列x[k]
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10.y=Z - π 2 kπ<x≤kπ,k∈