设全集 U ={-3,-2,-1,0,1,2,3},集合 A ={-1,0,1,2}, B ={-3,0,2,3},则A [img=12x16]1803dc74aee45b9.png[/img] CuB =( )
A: {-3,3}
B: {0,2}
C: {-1,1}
D: {-3,-2,-1,1,3}
A: {-3,3}
B: {0,2}
C: {-1,1}
D: {-3,-2,-1,1,3}
举一反三
- 设全集 U ={-3,-2,-1,0,1,2,3},集合 A ={-1,0,1,2}, B ={-3,0,2,3},则A [img=12x16]17de8834ab412bb.png[/img] CuB =( ) A: {-3,3} B: {0,2} C: {-1,1} D: {-3,-2,-1,1,3}
- 单元体的应力状态如图示,其主应力为( )[img=80x70]180347ed27c26a1.png[/img] A: σ1=σ2>0,σ3=0 B: σ1=0,σ2=σ3<0 C: σ1>0, σ2=0, σ3<0,∣σ1∣=∣σ3∣ D: σ1>0, σ2=0, σ3<0,∣σ1∣>∣σ3∣
- 以下代码的输出结果是( )[img=194x128]1803c8392449013.png[/img] A: 0 1 2 3 B: 1 2 3 C: 1 2 3 0 D: 0 1 2 3 0
- 若有定义:int a[4]={1,2,3};则数组a的每一个元素为( ) A: a[1]=1;a[2]=2;a[3]=3;a[4]=0; B: a[1]=1;a[2]=2;a[3]=3; C: a[0]=1;a[1]=2;a[2]=3;a[3]=0; D: a[0]=1;a[1]=2;a[2]=3;
- 【单选题】Which of the following matrices does not have the same determinant of matrix B: [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -1, 0, -9,-5] A. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 0; -1, 0, -9, -5] B. [1, 3, 0, 2; -2, -5, 7, 4; 1, 0, 9, 5; -1, 0, -9, -5] C. [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -3, -5, -2, -1] D. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 1; -1, 0, -9, -5]