题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040130-17331.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040130-65773.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040130-17331.png)
由三垂线定理得 AC1
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040130-17331.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040115-77736.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040116-78661.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040116-25058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040116-94864.png)
(Ⅰ)证明:BD //平面
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040116-86802.png)
(Ⅱ)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040116-27206.png)
(Ⅲ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040116-18552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040116-58243.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040116-36473.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040108-70419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040108-96874.png)
A.若m,n与a所成的角相等,则m∥![]() | B.若m∥![]() ![]() ![]() ![]() ![]() |
C.若m⊥a,m⊥n, 则![]() ![]() | D.若![]() ![]() ![]() ![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040101-32462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040102-77215.png)
A.若m //![]() ![]() ![]() ![]() |
B.若m⊥![]() ![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() ![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040049-67247.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040049-32226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040049-36079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040049-89566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040050-29274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040050-59101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040050-17910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040051-52751.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040051-38398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040051-31013.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040051-31895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040049-89566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040051-93939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040052-58496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040052-76419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040052-69947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040053-82956.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040053-73241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040044-70638.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040045-38316.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040045-44981.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040045-29441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106040045-44981.png)
A.充要条件 | B.充分不必要条件 |
C.必要不充分条件 | D.既不充分也不必要条件 |
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