题目内容

矩阵的秩等于列向量组的秩。

A. 对
B. 错

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矩阵的秩等于行向量组的秩。

A. 对
B. 错

对矩阵a进行初等变换冰化为行最简形记为B

A. 对
B. 错

By the end of this year ,I ____enough money for a holiday

A. will save
B. will be saving
C. will have saved
D. have saved

I have been studying here for four years by next summer ____.

A. shall graduate
B. shall be graduated
C. shall be graduating
D. shall have graduated

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