河南理工大学信号与系统试题答案

1.(B)A.B.C.D.2.(B)A.B.C.D.3.AABCLTIDLTIROC4.AA20B10C30D55.BA0B4CD6.ftfsBA3fsBC3fs-2D7.ZxnAACBD8.LTIh[n]=[n]+2[n-1]-3[n-2][n]BA[n]+[n-1]-5[n-2]+3[n-3]B[n]+3[n-1]C[n]D[n]+[n-1]-2[n-2]9.CABC-2jD10.(B)A.2sgn()B.-sgn()C.sgn()D.-sgn(1.31232.,,k|k|13.LTI=4.(-22)5.LTI26.2t-1)7.8.9.Z|z|010.Subplotholdonones1zeros(0t=-1:0.01:10t-1,0.01,10axisgridonplotstem.