过
所在平面
外一点P,作
,垂足为O,连接
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59169f91ebc758ba6e73fc99fcfaab15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c7267e5313b9b00ef22c94a479fc34.png)
A.若![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() |
D.若P到![]() ![]() |
更新时间:2022-09-13 16:13:57
|
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【推荐1】如图,已知正三棱柱
中,
为
的中点,直线
与平面
的交点为
,则以下结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/4b732747-5091-4baf-b66e-6f9283728c89.png?resizew=150)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9616af46dd9b6b50c1f41970388cedce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e884ca9429486026caa5e2310b0e4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/4b732747-5091-4baf-b66e-6f9283728c89.png?resizew=150)
A.![]() |
B.直线![]() ![]() ![]() |
C.在线段![]() ![]() ![]() |
D.以![]() ![]() ![]() ![]() |
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【推荐2】在长方体
中,已知
,则下列结论正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7422698f71359dcea51311755ce792.png)
A.![]() |
B.异面直线![]() ![]() ![]() |
C.二面角![]() ![]() |
D.四面体![]() ![]() |
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【推荐3】如图,已知正方体
中,
分别是
的中点,则下列判断正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/a20c703d-b078-4d30-883d-3fa9117809f6.png?resizew=223)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e203b7c9a6600e0272c58a23733490.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b70033c88f27f3709482f6dd3bf1e1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/a20c703d-b078-4d30-883d-3fa9117809f6.png?resizew=223)
A.![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() |
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解题方法
【推荐1】如图,正方体
的棱长为1,
,
分别是棱
的中点,过直线
的平面分别与棱
交于
,
两点,设
,以下说法中正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/9/24/2814913974853632/2817130742849536/STEM/2ee80581-6384-4af0-b0bb-362029ae75e4.png?resizew=260)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e86e3991200297ad172455e5ea93f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31be3b7305d6c181420ea7b28c420851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d87dccaf9f65ef67b126e9cf94bd8694.png)
![](https://img.xkw.com/dksih/QBM/2021/9/24/2814913974853632/2817130742849536/STEM/2ee80581-6384-4af0-b0bb-362029ae75e4.png?resizew=260)
A.平面![]() ![]() |
B.四边形![]() |
C.四边形![]() ![]() |
D.四棱锥![]() |
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【推荐2】如图,在直角梯形
中,
,且E为
的中点,M,N分别是
的中点,将三角形
沿
折起,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a281cf14ced6efafb46e9e12f79cfbf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b0a3fa475b24f57ecd79c681259561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
A.不论D折至何位置(不在平面![]() ![]() ![]() |
B.不论D折至何位置(不在平面![]() ![]() |
C.不论D折至何位置(不在平面![]() ![]() |
D.在折起过程中,一定存在某个位置,使![]() |
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【推荐1】嘌呤是一种杂环有机化合物,它在能量的供应、代谢的调节等方面都有十分重要的作用,它的化学结构式主要由一个正五边形与一个正六边形构成(设它们的边长均为1),其平面图形如图所示,则( )
A.![]() | B.O到AC的距离是![]() |
C.O是![]() | D.![]() |
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【推荐2】如图,在正方形ABCD中,
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,
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A.![]() | B.![]() |
C.![]() | D.![]() |
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