设随机变量X与Y相互独立，且X～N(1，4)，Y～N(0，1)，令Z＝X－Y，则D(Z)＝（）-湖北继续教育网网校

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[单选题]设随机变量X与Y相互独立，且X～N(1，4)，Y～N(0，1)，令Z＝X－Y，则D(Z)＝（）

A1

B3

C5

D6

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