题目
题型:单选题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114710-24431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114710-83070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114710-38848.png)
A.2 | B.3 | C.4 | D.8 |
答案
解析
在同一坐标系中作出曲线
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114711-21964.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114711-19562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114710-38848.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114711-19562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114711-23702.png)
故正确答案为
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114711-66934.png)
注:原题答案
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114712-57510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114712-60969.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114708-43172.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114709-68308.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114709-99163.gif)
A.2 | B.3 | C.4 | D.8 |
已知集合
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114706-87191.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114706-14904.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114706-61234.gif)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114706-86321.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114706-62867.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114707-71495.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817114707-39411.gif)
![](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.![]() ![]() |
![](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.![]() |
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