【单选题】已知线性方程Ax=β的增广矩阵可化为 且方程组有无穷多解,则参数A的取值必须满足( ).
【单选题】What does the English idiom "spring chicken" mean?
B.
a chicken hatched in spring
【单选题】When does he cook fried chicken?
A.
He fries chicken when mom goes out.
B.
He fries chicken when mom is at home.
C.
He fries chicken when mom is ill.
【单选题】已知线性方程组 的增广矩阵可化为 , 且方程组无解,则参数 必须满足( )