![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
设集合A={{1,2,3}, {4,5}, {6,7,8}},则下式为真的是()
A.1A
B.{1,2, 3}A
C.{{4,5}}A
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
C、{{4,5}}A
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.1A
B.{1,2, 3}A
C.{{4,5}}A
C、{{4,5}}A
设集合A={1,2,3},B={2,3},C={1,3,4},则(A∩B)∪C等于
A.{1,2,3}
B.{1,2,4}
C.{1,3,4}
D.{1,2,3,4}
A.{0,1,2,3,4,6}
B.{1,2,3,4}
C.{2,4}
D.{2,4,6}
以下代码的运行结果为()。
x=[1,2,3];
x.append([4,5]);
x.extend([6,(7,8)]);
print(x);
A.[1,2,3,4,5,6,7,8]
B.[1,2,3,[4,5],6,(7,8)]
C.[1,2,3,4,5,[6,(7,8)]]
D.[1,2,3,[4,5],6,7,8]
A.a=[[1,2,3],[4,5],[7]]
B.a=[1,2,3]+[4,5,6]+[7,8,9]
C.a=[[1,2,3],[4,5,6],[7,8,9]]
D.a=[[0]*4]*5
A.int a[2][ ]={{1,0,1},{5,2,3}}
B.int a[ ][3]={{1,2,3},{3,2,1}}
C.int a[2][4]={1,2,3},{4,5},{6}}
D.int a[ ][ ]={1,2,3,4,5,6,7}