题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013109-33753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013110-72608.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013110-31394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013110-57308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013110-89205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013111-24316.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013111-74144.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() ![]() | D.![]() ![]() ![]() |
答案
解析
试题分析:若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013112-13569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013110-72608.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013110-31394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013110-57308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013110-89205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013112-22801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013109-33753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013112-49291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013113-38526.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013113-22994.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013113-96424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013110-31394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013110-89205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013114-50232.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013102-53610.jpg)
(1)求证:OB⊥AC;
(2)若AC与圆柱下底面所成的角为30°,OA=2。求三棱锥A-BOC的体积。
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013055-92664.png)
(1)求证:直线AB1∥平面C1DB;
(2)求异面直线AB1与BC1所成角的余弦值
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013042-36820.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013043-20423.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013043-35092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013043-59593.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013044-57401.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013044-36203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013044-33939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013044-47163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013045-14661.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013045-89737.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013045-87298.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013045-21789.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013045-47327.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013046-94903.png)
(2)求平面
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013046-14011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013044-36203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013037-73907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013037-78440.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013037-26178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013038-34652.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013038-81332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013038-59229.png)
其中,真命题是( )
A.①④ | B.②③ | C.①③ | D.②④ |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013032-27641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-58615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-59111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-71144.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-59111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-71144.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013032-27641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-59111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013032-27641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-71144.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013032-27641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-59111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013032-27641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-71144.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-59111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-71144.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013032-27641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-59111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013032-27641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-58615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-58615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-59111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013032-27641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-59111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-44005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-59111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013033-71144.png)
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