单项选择题
A.2% B.2.5% C.3% D.3.5%
A.最小值的100% B.最小值的150% C.平均值的50% D.平均值的100%
A.1.5% B.2% C.2.5% D.3%
A.1/2 B.1/3 C.1/4 D.1/5
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