题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013016-69531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013016-36769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013017-86322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013017-78473.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013017-12294.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013017-80979.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013018-87142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013018-25467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013018-22513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013017-86322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013017-78473.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013018-22513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013017-86322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013018-34419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013018-22513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013019-88122.png)
其中正确的是 (将正确命题的序号全填上).
答案
解析
试题分析:如图可知①不正确;对于②连接AF、CF可知
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013019-84347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013019-82242.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013019-40157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013020-22006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013020-24558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013020-97078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013020-17595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013017-78473.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013020-17595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013021-24016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013021-79504.png)
核心考点
试题【将边长为2,锐角为的菱形沿较短对角线折成二面角,点分别为的中点,给出下列四个命题:①;②是异面直线与的公垂线;③当二面角是直二面角时,与间的距离为;④垂直于截面】;主要考察你对向量与空间位置关系等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013000-92899.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106013000-93626.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012953-83787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012953-17556.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012953-90168.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012954-51764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012954-72019.png)
A.![]() |
B.平面![]() ![]() |
C.![]() ![]() |
D.![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012937-11720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012937-86049.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012937-57449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012937-40415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012938-19023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012938-29853.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012938-48742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012938-22426.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012938-24696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012938-33193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012938-40287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012939-38322.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012939-71190.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012939-20366.png)
(2)当三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012939-75022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012940-78768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012939-38322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012940-64285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012926-19279.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012926-32326.png)
A.若![]() ![]() ![]() ![]() ![]() |
B.若![]() ![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012907-74360.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012907-51796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012908-73853.png)
(1)若M为PA中点,求证:AC∥平面MDE;
(2)求直线PA与平面PBC所成角的正弦值;
(3)在线段PC上是否存在一点Q(除去端点),使得平面QAD与平面PBC所成锐二面角的大小为
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106012908-52568.png)
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