题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071924-24299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071924-89187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071924-60327.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071924-65749.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071925-56484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071925-71714.png)
A.过点P垂直于平面![]() ![]() |
B.过点P在平面![]() ![]() ![]() |
C.过点P垂直于平面![]() ![]() |
D.过点P垂直于直线![]() ![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071925-82452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071926-24346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071926-49435.png)
由题意和面面垂直的判定定理知,选项B正确;
由题意和面面垂直的性质定理知,选项C正确;
过点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071925-82452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071926-42440.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071926-24346.png)
故选D
核心考点
试题【 若平面,,满足,,,,则下列命题中的假命题为A.过点P垂直于平面的直线平行于平面B.过点P在平面内作垂直于的直线必垂直于平面C.过点P垂直于平面的直线在平面内】;主要考察你对线线角等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071914-30276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071914-77610.png)
A.0 | B.![]() | C.0或![]() | D.以上都不对 |
已知三棱柱ABC-A1B1C1的侧棱垂直于底面,
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071906-14277.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071906-43105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071906-30055.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071907-67688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071907-51399.png)
(Ⅱ)若点P在线段BN上,且三棱锥P-AMN的体积
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071907-84111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071907-68815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071907-27237.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071852-92602.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071852-65219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071852-74359.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071852-74359.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071852-40184.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071852-48453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071852-54353.png)
(2)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071853-57200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071852-54353.png)
(3)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071853-68835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071853-76920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071844-66170.png)
A.若a//b,b![]() ![]() | B.![]() ![]() |
C.若![]() ![]() | D.![]() |
如图,在直三棱柱
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071835-16019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071835-71980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071835-23851.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071835-71162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071836-65708.png)
(I)证明:ED为异面直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071835-71162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071836-65708.png)
(II)设
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071836-85304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071836-36207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022071836-30335.png)
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