题目内容

What causes women to be always dissatisfied with their looks?

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What is the author's attitude toward the claim that women care much about their appearance due to pressure from men?

初等行变换改变方程组的解( )。

A. 对
B. 错

如果两个方程组等价，则它们解的情况相同。()

A. 对
B. 错

齐次线性方程组中的常数项都为0。()

A. 对
B. 错