题目
题型:单选题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114702-80800.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114702-11008.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114702-99308.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114703-67074.gif)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114704-45030.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114704-63964.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114704-34006.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114659-61777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114659-81411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114659-81437.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114657-23451.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114657-63563.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
①“若
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114652-50472.gif)
②“若
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114652-61722.gif)
③“若
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114653-13606.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114653-65784.gif)
④“若
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114653-23744.gif)
其中真命题的个数是( )
A.0 | B.1 | C.2 | D.3 |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114650-98078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114650-86358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114650-40720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114650-64552.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114644-13919.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114644-95799.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114644-43651.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114644-67679.gif)
(1)任取
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114644-23511.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114645-12921.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114645-98005.gif)
(2)任取
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114645-94205.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114645-63656.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114645-58527.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114646-71384.gif)
则称映射
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114644-43651.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114644-67679.gif)
例如:用表1表示的映射
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114644-43651.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114646-52710.gif)
表1 表2
![]() | 1 | 2 | 3 |
![]() | 2 | 3 | 1 |
![]() | 1 | 2 | 3 | 4 |
![]() | | 3 | | |
(1)已知
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114644-43651.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114646-72247.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114644-43651.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114647-66643.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114647-80157.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114647-32434.gif)
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