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【单选题】
以下结论正确的为( ) .A.
一个向量组的秩只能为正整数，不能为0 .
B.
所有的向量组极大无关组.
C.
向量组的秩一定小于向量组中所含向量的个数.
D.
若向量组的秩为2，则此向量组中任意3个向量（若存在）都线性相关.
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