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【单选题】
设A,B都是n阶方阵，下列说法正确的是（ ）A.
若A,B 都是对称阵，则AB 也是对称阵
B.
若 ，且 ，则
C.
若AB 是奇异阵，则A，B 都是奇异阵
D.
若AB 是可逆阵，则 A，B 都是可逆阵
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