Assume that Z(t) = X(t) + Y(t), where X(t) and Y(t) are jointly stationaryrandom processes,then Sz(f) = Sx(f) + Sy(f)
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1.Assume that Z(t) = X(t) + Y(t), where X(t) and Y(t) are jointly stationaryrandom processes,then Sz(f)
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2.8.下列等式不成立的是A(T-t)*2(t to)=f()*f().[(*)dtf2(t)A、f(t)*8(t)=f(n)B、f()*(t)=f(t
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3.65 f()*tu()=tu(),f(t)
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4.(3) f(x, y,z)= ry y = l,x y z= 0.
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5.(2)y' cos x=esim t
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6.G71 P(ns) Q(nf) U(Δu) W(Δw) F(f) S(s) T(t)中F、S、T在循环时无效?
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7.d16(2t 1)(t)F
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8.设 z = f(u, v),u = φ(x, y),v = ψ(x, y),则∂z/∂x = ( )
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9.9.已知信号f(t)的傅里叶变换F(j)=u( ay)-u(-a),则f(t)为ASAA、2ax Sa(s t)B、2a, Sa(
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10.设f(x y,xy)=x2 Y2,则f(x,y)=( )