单选题:设A为m×n矩阵,P、Q分别是m阶和n阶可逆矩阵,则下列方程组中与方程组Ax=b同解的是(  )

题目内容:
设A为m×n矩阵,P、Q分别是m阶和n阶可逆矩阵,则下列方程组中与方程组Ax=b同解的是(  ) A.PAx=Pb
B.PAx=b
C.AQx=b
D.PAQx=b
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