A. 一个向量组的秩等于其极大线性无关组里向量的个数 B. 一个向量组的极大无关组只有一个 C. 一个向量组与其极大线性无关组等价 D. 一个向量组的秩与其极大线性无关组的秩相等
A. To clean the toliets in a hospital. B. To teach in a local school. C. To build toilets and help in an eye hospital. D. To work as a cleaner in a school.