在正三棱柱
中,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2051053fd4f9949a13fc4c775930c07f.png)
,则下列结论不正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6c5282bc1ea20767a6c092c22c761ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2051053fd4f9949a13fc4c775930c07f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38eb357ad09d7e1e1e3d295c8d1ee01c.png)
A.不存在![]() ![]() ![]() |
B.当![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.过![]() ![]() ![]() ![]() |
更新时间:2023-11-23 13:31:36
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【推荐1】某几何体的三视图如图所示,若该几何体的体积为
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【推荐2】如图,在三棱锥
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A.平面![]() ![]() |
B.二面角![]() ![]() |
C.![]() ![]() ![]() |
D.三棱锥![]() ![]() |
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【推荐1】已知一个四棱锥三视图如图所示,若此四棱锥的五个顶点在某个球面上,则该球的表面积为( )
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【推荐2】已知P,A,B,C是半径为2的球面上的点,O为球心,
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【推荐1】如图,在正方体
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其中正确的个数是( )
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①三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fe55aba4a8d01b6aa7e0583aac23f4f.png)
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②若异面直线
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其中正确的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/58dc6818-e84a-4bb7-a3e2-6023b0c7aaa6.png?resizew=176)
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【推荐2】《九章算术》是中国古代数学专著,承先秦数学发展的源流,进入汉朝后又经许多学者的删补才最后成书.在《九章算术》中,将四个面都为直角三角形的四面体称之为鳖臑.在三棱锥
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