如图,直角梯形
,
,
,
,
为
中点,以
为折痕把
折起,使点
到达点
的位置,且
则( )
![](https://img.xkw.com/dksih/QBM/2021/1/28/2645756579774464/2646853622251520/STEM/3a44a7e236b5408fb0cdebea652a11c9.png?resizew=156)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33300b171cc4e368520f9de8537e85c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9641d01140939c44450bf39773272af6.png)
![](https://img.xkw.com/dksih/QBM/2021/1/28/2645756579774464/2646853622251520/STEM/3a44a7e236b5408fb0cdebea652a11c9.png?resizew=156)
A.平面![]() ![]() | B.![]() ![]() ![]() |
C.二面角![]() ![]() | D.![]() |
更新时间:2021-01-30 00:20:23
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【推荐1】在边长为2的正方体
中,动点
满足
(
),则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/484bf9a29c521dabaebe578b1f07e2d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee72261f6901e62dfd0ffe547406544.png)
A.若![]() ![]() ![]() ![]() |
B.三棱锥![]() |
C.若![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() |
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【推荐2】如图,在四棱锥
中,四边形
是边长为2的正方形,
与
交于点
,
平面
,且
,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/19/fb5737e6-2500-4f3b-ad43-dd9950d3d03b.png?resizew=159)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/19/fb5737e6-2500-4f3b-ad43-dd9950d3d03b.png?resizew=159)
A.![]() ![]() | B.四棱锥![]() ![]() |
C.四棱锥![]() | D.直线![]() ![]() ![]() |
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【推荐3】在棱长为2的正方体
中,点
为线段
上一动点,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/e56f90fe-9110-4fd3-834e-27e9f4f26d07.png?resizew=182)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/e56f90fe-9110-4fd3-834e-27e9f4f26d07.png?resizew=182)
A.在![]() ![]() ![]() |
B.三棱锥![]() |
C.当![]() ![]() ![]() ![]() ![]() |
D.当![]() ![]() ![]() ![]() |
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【推荐1】如图,AC为圆O的直径,
,PA垂直于圆O所在的平面,B为圆周上不与点A,C重合的点,
于S,
于N,则下列选项正确的是( )
![](https://img.xkw.com/dksih/QBM/2020/10/23/2577319240261632/2578767789301760/STEM/21fededdfa3347d98b45ca40a68e4829.png?resizew=123)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e93e1661d70eca6d7eb848b667e388e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04fc0b3ec075acc4214d81086da6a1a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bed042f2f69d038b6b5c08c9ffb18a9.png)
![](https://img.xkw.com/dksih/QBM/2020/10/23/2577319240261632/2578767789301760/STEM/21fededdfa3347d98b45ca40a68e4829.png?resizew=123)
A.平面![]() | B.平面 ![]() |
C.平面 ![]() | D.平面 ![]() |
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【推荐2】在边长为6的正三角形ABC中M,N分别为边AB,AC上的点,且满足
,把△AMN沿着MN翻折至A′MN位置,则下列说法中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4171b62d82dec124b88a7647c100a1.png)
A.在翻折过程中,在边A′N上存在点P,满足CP∥平面A′BM |
B.若![]() |
C.若![]() |
D.在翻折过程中,四棱锥A′-BCNM体积的最大值为![]() |
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【推荐1】已知S为圆锥的顶点,
为该圆锥的底面圆
的直径,
为底面圆周上一点,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bceb81947c64c43ebee982e63f6eaf28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a1e5b7264abd0cd577052f5271ed51.png)
A.该圆锥的体积为![]() |
B.![]() |
C.该圆锥的侧面展开图的圆心角大于![]() |
D.二面角![]() ![]() |
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【推荐2】如图,正四面体ABCD的顶点A,B,C分别在两两垂直的三条射线Ox,Oy,Oz上,则下列结论错误的为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/15/9f1607e7-d5f1-4c59-94a9-dc91a0e864ab.png?resizew=142)
A.![]() |
B.直线![]() |
C.直线AD与OB所成的角是45° |
D.二面角![]() |
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