n元线性方程组Ax=O有非零解的充要条件是（　　）-湖北继续教育网网校

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n元线性方程组Ax=O有非零解的充要条件是（　　）

A方程个数m<n

B方程个数m>n

C方程个数m=n

D秩(A)<n

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