已知平面α和平面β交于直线l,P是空间一点,PA⊥α,垂足为A,PB⊥β,垂足B,且PA=1,PB=2,若点A在β内的射影与点B在α内的射影重合,则点P到l的距
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已知平面α和平面β交于直线l,P是空间一点,PA⊥α,垂足为A,PB⊥β,垂足B,且PA=1,PB=2,若点A在β内的射影与点B在α内的射影重合,则点P到l的距离为( ) |
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举一反三
在长方体ABCD﹣A1B1C1D1中,如果AB=BC=1,AA1=2,那么A到直线A1C的距离为 |
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A.![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022092346-63283.png) B.![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022092346-41925.png) C.![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022092346-86423.png) D.![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022092347-44170.png) |
正方体AC1中,侧面ABB1A1内有一动点P,它到直线A1B1与到直线BC的距离相等,则点P的轨迹是下图中的 |
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A.![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022092343-50486.png) B.![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022092343-92952.png) C.![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022092343-26610.png) D.![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022092343-75758.png) |
P是边长为a的正三角形ABC外一点,AP⊥PB,PB⊥PC,PC⊥PA,且PA=PB=PC,则P到△ABC所在平面的距离为( )。 |
在长方体ABCD﹣A1B1C1D1中,如果AB=BC=1,AA1=2,那么A到直线A1C的距离为 |
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A.![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022092337-54615.png) B.![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022092337-18442.png) C.![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022092337-66221.png) D.![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022092338-83909.png) |
点P(﹣2,1)到直线2x+y=5的距离为 |
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A.![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022092333-69720.png) B.![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022092334-44693.png) C.![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022092334-38236.png) D.![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022092334-54391.png) |
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