设(X,Y)为二维随机变量,且D(X)>0,D(Y)>0,则下列等式成立的是
A.E(XY)=E(X)·E(Y)
B.
C.D(XY)=D(X)·D(Y)
D.Cov(2X,2Y)=2Cov(X,Y)
正确答案是B
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