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【单选题】
以下是A、B两组学生学费数据，A组学生学费是3000、3500、5000、5300，B组学生学费是6000、6500、2800,9000欲比较这两种学生学费差异程度大小，用的方法是（ ）。A.
极差
B.
标准差
C.
离散系数
D.
算术平均数
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【单选题】The women use the saying' All men are created equal' to show that ______.
A.
the position of women has changed a little in modem time
B.
in American society men and women should be equal
C.
men's rights are always considered more important than women's
D.
men and women had equal power in early American society
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