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【单选题】
下列各组数据中,()能作为一组 进行加权平均数的“权”A.
1/4,1/2,1/12,1/6
B.
1/3,1/2,0,1/6
C.
1/3,1/2,-1/12,1/6
D.
1/3,1/2,1,1/6
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