ρxy(τ)为信号x(t)和y(t)的互相关系数；若x(t)和y(t)完全不相关，则
A.|ρxy(τ)|=0
B.0<|ρxy(τ)|<1
C.|ρxy(τ)|=1
D.|ρxy(τ)|>1
正确答案是A
