【简答题】设有两个n元齐次线性方程组:Ax=0及Bx=0.证明:
【单选题】人体各系统发育不平衡,有先后之分,发育最晚的系统是( )
【简答题】若n元齐次线性方程组舭=0的系数矩阵的秩R(A)-n,该方程组是否有基础解系?
【简答题】n元齐次线性方程组Ax=0的基础解系是否唯一?
【简答题】英译汉: Because rail transport lacks the flexibility of truck carriers,rail transport provides terminal-to terminal service rather than door-to-door service.