题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235544-12856.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235544-93378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235545-27462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235545-79588.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235545-28808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235545-69540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235546-41389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235546-59964.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235546-64295.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235546-77883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235546-49474.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235548-26036.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235548-12024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235548-58233.png)
核心考点
试题【 两点在平面的同侧,于.于.、于,,则的长是( )A.B.C.D.】;主要考察你对空间几何体的结构特征等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235536-92931.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235531-97398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235531-39293.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235531-39059.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235531-17110.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235531-36379.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235531-39059.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235531-17110.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235532-98636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235532-62238.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235531-39059.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235531-17110.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235532-71123.png)
④
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235532-99735.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235533-20970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235533-31440.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235533-19102.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235532-99735.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235533-60016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235534-11941.png)
其中真命题的编号是_____________
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235521-74055.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235521-69378.png)
(1)求证:平面
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235521-71321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235522-44509.png)
(2)求直线PA与平面PBC所成角的正弦值;
(3)若动点M在底面三角形ABC上,二面角M-PA-C的余弦值为
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235522-68552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235522-48189.png)
①m//α,m//β,则α//β; ②m⊥l,n⊥l,则m//n;
③l⊥α,l//β,则α⊥β; ④α⊥l,β⊥l,α//β
在这四个命题中,正确的命题有
A.①② | B.③④ |
C.①② | D.②④ |
(I)证明:EF⊥AH;
(II)求平面EFC与平面BB′C′所成夹角的余弦值.
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235451-65048.png)
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