（單選題）
（單選題）下列說法正確的是
（單選題）有等式AB=0?，則下列結(jié)論中正確的是（）
設(shè)A為m×n矩陣，齊次線性方程組Ax=0有非零解的充分必要條件是
???????
（單選題）
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齊次線性方程組的解
齊次線性方程組有非零解，則系數(shù)行列式的值為0，從而可以解得未知數(shù)k的值
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