题目
题型:填空题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084726-91840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084726-91840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084726-32056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084726-91840.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084726-91840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084726-91840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084726-91840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084726-91840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084726-91840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084726-96995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084726-91840.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084726-58904.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084727-27721.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084727-70587.png)
④
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084727-54491.png)
其中是集合X上的拓扑的集合
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084726-91840.png)
答案
解析
试题分析:对于集合①,
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084727-85446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084727-51531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084727-51531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084728-86225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084727-51531.png)
核心考点
试题【若X是一个集合,是一个以X的某些子集为元素的集合,且满足:①X属于,属于;②中任意多个元素的并集属于;③中任意多个元素的交集属于.则称是集合X上的一个拓扑.已知】;主要考察你对集合运算等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084721-38972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084722-85488.png)
A.{0,1} | B.{-1,0} | C.{-1,0,1} | D.{-2,-1,0,1,2} |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084720-76592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084720-41610.png)
A.(-2,2) | B.(-2,0) | C.(0,2) | D.(-2,-1) |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084716-96725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084717-90219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084717-48935.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084713-50559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084713-34928.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084714-36592.png)
A.![]() ![]() | B.![]() ![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084710-22569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084711-27739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084711-47401.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817084711-81322.png)
A.21 | B.8 | C.7 | D.6 |
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