下列哪个命令生成X服从参数为3的3×4的泊松分布的随机矩阵: A: random(’possion’,3,3,4) B: random(’possion’,3,4,3) C: random(’binornd’,3,3,4) D: random(’binornd’,3,4,3)

正确进行数组初始化的是( )。 A: int s[2][]={{2,1,2},{6,3,9; B: int s[][3]={9,8,7,6,5,4}; C: int s[3,3]={{1},{4},{6; D: int s[3][4]={{1,1,2},{3,3,3},{3,3,4},{4,4,5;

设以下三个向量组\(S_{1}\)=\(\{\alpha_{1},\alpha_{2},\alpha_{3} \},\)\(S_{2}\)=\(\{\alpha_{1},\alpha_{2},\alpha_{3},\alpha_{4}\},\)\(S_{3}\)=\(\{\alpha_{1},\alpha_{2},\alpha_{3},\alpha_{5}\} \)的秩依次为\(3,3,4,\)则\(S={\alpha_{1},\alpha_{2},\alpha_{3},\alpha_{5}-\alpha_{4} }\)的秩为______ 。

设以下三个向量组\(S_{1}\)=\(\{\alpha_{1},\alpha_{2},\alpha_{3} \},\)\(S_{2}\)=\(\{\alpha_{1},\alpha_{2},\alpha_{3},\alpha_{4}\},\)\(S_{3}\)=\(\{\alpha_{1},\alpha_{2},\alpha_{3},\alpha_{5}\} \)的秩依次为\(3,3,4,\)则\(S={\alpha_{1},\alpha_{2},\alpha_{3},\alpha_{5}-\alpha_{4} }\)的秩为______ 。

设以下三个向量组\(S_{1}\)=\(\{\alpha_{1},\alpha_{2},\alpha_{3} \},\)\(S_{2}\)=\(\{\alpha_{1},\alpha_{2},\alpha_{3},\alpha_{4}\},\)\(S_{3}\)=\(\{\alpha_{1},\alpha_{2},\alpha_{3},\alpha_{5}\} \)的秩依次为\(3,3,4,\)则\(S={\alpha_{1},\alpha_{2},\alpha_{3},\alpha_{5}-\alpha_{4} }\)的秩为______ 。

设以下三个向量组\(S_{1}\)=\(\{\alpha_{1},\alpha_{2},\alpha_{3} \},\)\(S_{2}\)=\(\{\alpha_{1},\alpha_{2},\alpha_{3},\alpha_{4}\},\)\(S_{3}\)=\(\{\alpha_{1},\alpha_{2},\alpha_{3},\alpha_{5}\} \)的秩依次为\(3,3,4,\)则\(S={\alpha_{1},\alpha_{2},\alpha_{3},\alpha_{5}-\alpha_{4} }\)的秩为______ 。

设以下三个向量组\(S_{1}\)=\(\{\alpha_{1},\alpha_{2},\alpha_{3} \},\)\(S_{2}\)=\(\{\alpha_{1},\alpha_{2},\alpha_{3},\alpha_{4}\},\)\(S_{3}\)=\(\{\alpha_{1},\alpha_{2},\alpha_{3},\alpha_{5}\} \)的秩依次为\(3,3,4,\)则\(S={\alpha_{1},\alpha_{2},\alpha_{3},\alpha_{5}-\alpha_{4} }\)的秩为______ 。

语句x=（a=3,b=++a）；运行后x,a,b的值依次为（　　） A: 3，3，4 B: 4，3，3 C: 4，4，4 D: 3，4，3

三餐分配合理比例是( ) A: 3:4:3 B: 2:5:3 C: 4:3:3 D: 3:3:4 E: 2:4:4

学生的一日三餐的能量分配比应为( )。 A: 3:3:4 B: 3:4:3 C: 2:4:4 D: 3:5:2 E: 4:3:3