单项选择题
A.6B.18C.24D.48
A.0B.0.2C.0.4D.0.6
A.0.189B.0.21C.0.441D.0.7
A.ρXY·√D(X)·√D(Y)B.ρXY·D(X)·D(Y)C.E(X)·E(Y)D.D(X)·D(Y)
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