单项选择题

设矩阵的秩为r，则下述结论中正确的是（）

A.A中有一个r阶子式不等于零
B.A中任意一个r-1阶子式不等于零
C.A的任意一个r阶子式不等于零
D.A中有一个r+1阶子式不等于零

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单项选择题

Which one is the top one among the four famous jin, and it has always been the royal tribute in Yuan, Ming and Qing Dynasties. With the development of this technique, four famous jin have been produced in our history. A. Nanjing yunjin B. Guangxi zhuangjin C. Suzhou songjin D. Chengdu shujin

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正确
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答案：错误