设是矩阵,则齐次线性方程组有非零解的充分必要条件是(    )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='3316' and id < 256888 and id<>'256888' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='3316' and id > 256888 and id<>'256888' order by id asc limit 5