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【单选题】
Pamela is a young mother whose parents are both deceased. Assuming that disease X is a genetic disorder with either a dominant or a recessive inheritance pattern, which of the following statements is accurate?A.
If neither of Pamela’s parents ever had disease X, then Pamela does not and never will have disease X.
B.
If neither Pamela nor the father of Pamela’s child has disease X, then that child will never have disease X.
C.
If both of Pamela’s parents had at least one copy of the disease X gene,then Pamela also has at least one copy of the disease X gene.
D.
If neither of Pamela’s parents ever had disease X, but Pamela has disease X,then disease X is not a dominantly inherited genetic disorder.
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【简答题】设A为m×n实矩阵.证明：对于任何m维实的非零列向量b，非齐次线性方程组A T Ax=A T b必有解.
【单选题】设A为m×n矩阵,齐次线性方程组 Ax=0有非零解的充分必要条件是( )
A.
A的列向量组线性相关
B.
A的列向量组线性无关
C.
A的行向量组线性相关
D.
A的行向量组线性无关
【单选题】设矩阵Am×n的秩r(A)＝m＜Em，Em为m阶单位矩阵，下述结论中正确的是
A.
A的任意m个列向量必线性无关．
B.
A的任意一个m阶子式不等于零．
C.
A通过初等行变换，必可以化为(Em，0)形式．
D.
非齐次线性方程组Ax＝b一定有无穷多组解．
【单选题】设A为m×n矩阵，m≠n，则齐次线性方程组Ax＝0有非零解的充要条件是 （ ）
A.
A的行向量组线性相关
B.
A的行向量组线性无关
C.
A的列向量组线性无关
D.
A的列向量组线性相关
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