三棱锥
中,
平面
,
,
,
,
、
与以
为直径的球
的球面分别交于点
、
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab2c27eac56fffa4cd7dbe1dcdf1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2e679d7b314ff58c284da08e8edbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
A.![]() | B.![]() ![]() |
C.![]() | D.球![]() ![]() ![]() ![]() |
更新时间:2022-04-03 17:41:35
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【推荐1】正方体ABCD﹣A1B1C1D1的棱长为4,E,F分别为棱DD1,BB1上的动点,满足D1E=BF,则以下命题正确的有( )
A.三角形A1EF的面积始终保持不变 |
B.三棱锥C1﹣A1EF的体积始终不变 |
C.C1到面A1EF的距离最大为![]() |
D.若点G在线段EF上,且EG=2GF,则过G的平面截正方体外接球所得截面面积最小为![]() |
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【推荐2】已知正方体
的棱长为1,
分别为
的中点.下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/1/28/2904183827865600/2904731121229824/STEM/1d8fc62d-7014-4378-847a-ae990667bbed.png?resizew=190)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e79a03b1084cb2e8f8ac00329fe98544.png)
![](https://img.xkw.com/dksih/QBM/2022/1/28/2904183827865600/2904731121229824/STEM/1d8fc62d-7014-4378-847a-ae990667bbed.png?resizew=190)
A.正方体![]() ![]() |
B.面![]() ![]() ![]() |
C.三棱锥![]() ![]() |
D.直线![]() ![]() ![]() |
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【推荐3】为庆祝党的二十大胜利召开,由南京市委党史办主办,各区委党史办等协办组织的以“喜迎二十大 永远跟党走 奋进新征程”为主题的庆祝中共南京地方组织成立
周年知识问答活动正在进行,某党支部为本次活动设置了一个冠军奖杯,奖杯由一个铜球和一个托盘组成,如图①,已知球的体积为
,托盘由边长为
的正三角形铜片沿各边中点的连线垂直向上折叠而成,如图②.则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/af7ff285-682f-4a63-8a35-b70d9525316b.png?resizew=181)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/6d5ad093-05b9-47cd-9956-c29d6493d88c.png?resizew=362)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82f028f53bc97d6db2877c54ba3d69b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0b008761be40e10788dbf9bf93f9bb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b4ff7f6afe9951d5ef284479de3b985.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/af7ff285-682f-4a63-8a35-b70d9525316b.png?resizew=181)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/6d5ad093-05b9-47cd-9956-c29d6493d88c.png?resizew=362)
A.经过三个顶点![]() ![]() |
B.异面直线![]() ![]() ![]() |
C.连接![]() ![]() ![]() ![]() |
D.点![]() ![]() |
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【推荐1】在三棱锥
中,
分别是棱
的中点,下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eca0ceed683ca3edc68038592582000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481e426224c3a3ce9bb5a731eed81c40.png)
A.![]() ![]() ![]() | B.![]() |
C.三棱锥![]() ![]() | D.![]() ![]() |
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【推荐2】如图,正方体
中,顶点A在平面α内,其余顶点在α的同侧,顶点
,B,C到
的距离分别为
,1,2,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/035c5dcf-9a43-41c7-a894-4905fcd1bd2a.png?resizew=150)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/035c5dcf-9a43-41c7-a894-4905fcd1bd2a.png?resizew=150)
A.BC∥平面![]() |
B.平面A1AC⊥平面![]() |
C.直线![]() ![]() ![]() ![]() |
D.正方体的棱长为2![]() |
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