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问题描述:

[单选] 在下列各向量中,()是概率向量。()
A.(0.6,0.2,0.02,0.21) B.(0.3,0.3,0.28,0.12) C.(0.15,0.25,0.5,0.11) D.(0.18,0,0.39,0.40)
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