题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235318-16807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235318-65345.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235319-74230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235319-97852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235319-37278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235319-66580.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235320-97618.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235321-24234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235319-37278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235319-66580.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235321-94465.png)
核心考点
试题【如图,在正方体中,,分别是的中点,则异面直线与所成角为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/20191020/20191020235310-51887.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235310-83007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235310-21908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235311-77755.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235311-18645.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235311-48719.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235311-30087.png)
⑴ 求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235312-25941.png)
⑵ 求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235312-60539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235312-59245.png)
⑶ 求直线
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235312-34402.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235313-67485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235302-62178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235302-93920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235302-83001.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235302-48439.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235303-95989.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235303-41271.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235303-39451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235303-14963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235304-78437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235304-56253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235304-20849.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235304-84246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235232-58590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235232-52501.png)
(1)求证:AD^BC
(2)求二面角B-AC-D的大小
(3)在直线AC上是否存在一点E,使ED与面BCD成30°角?若存在,确定E的位置;若
不存在,说明理由.
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235226-83503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235226-26384.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235226-79606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235226-62928.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235226-62492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235227-71003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235227-32643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235227-37779.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235227-30099.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235228-87135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235219-48199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235219-40072.png)
① 若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235219-25530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235220-90692.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235220-22869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235220-38797.png)
③ 若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235220-29430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235220-99234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235221-55264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020235221-75992.png)
其中正确的命题是 .(写出所有正确命题的序号)
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