单项选择题
With oppression being changed for oppression everywhere, that society has fallen into a ___________ cycle.
A.pathetic B.vicious
C.practicable
D.feeble
With oppression being changed for oppression everywhere, that society has fallen into a ___________ cycle.
A.pathetic B.vicious
C.practicable
D.feeble
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单项选择题
下面不属于典型变量性质的是（ ）。
下面不属于典型变量性质的是（ ）。
A．
每一对典型变量的ui和vi方差都为1
B．
同组变量任意两个典型变量ui、uj不相关
C．只有当i = j时，ui和vi才相关
D． 第一对典型变量的相关系数不一定最大。