在长方体
中,
,
是棱
的中点,过点
,
,
的平面
交棱
于点
,点
为线段
上一动点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5202326ed1404e64ab72d7dfa060733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408871c2b71ef88d6f556ce53cf73cc9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/25/bd2e0796-6dcf-4970-b5c4-060ac4635444.png?resizew=158)
A.当且仅当点![]() ![]() ![]() |
B.不存在点![]() ![]() |
C.直线![]() ![]() ![]() |
D.三棱锥![]() ![]() |
更新时间:2023-07-21 15:37:52
|
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【推荐1】一个圆锥的底面圆周和顶点都在一个球面上,已知圆锥的底面面积与球面面积比值为
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【推荐2】如图,正八面体
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【推荐1】下图中正方体
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/1eaf0351-e002-4509-a1db-f7dc3c98728a.png?resizew=180)
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A.平面![]() ![]() |
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【推荐2】已知圆锥顶点为,底面圆
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【推荐3】已知在正三棱锥
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
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A.正三棱锥![]() ![]() |
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【推荐2】如图,在矩形
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,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5bb280919fefd301bcc544e9c7c65c.png)
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