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分类: 数学2 (军队文职)
发布时间: 2023-11-03 09:29
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A.当t=6时，P的秩必为1
B.当t=6时，P的秩必为2
C.当t≠6时，P的秩为1
D.当t≠6时，P的秩为2
正确答案是C
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