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【单选题】
设随机变量X和Y的方差存在且不等于0,则D(X+Y)=D(X)+D(Y)是X和Y
A.
不相关的充分条件，但不是必要条件
B.
独立的充分条件，但不是必要条件
C.
不相关的充分必要条件
D.
独立的充分必要条件
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