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【单选题】
设 f(x) 是连续型随机变量 X 的概率密度函数,则下列选项正确的( )
A.
f(x) 连续
B.
P(X=a)= f(a),a∈R
C.
f(x) 的值域为 [0,1]
D.
f(x) 非负
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