單項(xiàng)選擇題

設(shè)A為n階實(shí)對(duì)稱矩陣,C是n階是可逆矩陣,且B=CTAC,則()

A.A與B相似
B.A與B不等階
C.A與B有相同的特征值
D.A與B合同

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