在
中,
,
,
,如图所示,将
绕
逆时针旋转120°至
处,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/24/315b84b9-fa75-4442-8dc2-0016875a3d34.png?resizew=162)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19fc9f894312e55c87a0d6737080e233.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86324ed305dbdaf5fcae861f2a2ffb23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/24/315b84b9-fa75-4442-8dc2-0016875a3d34.png?resizew=162)
A.在旋转过程中,点![]() ![]() |
B.点![]() ![]() ![]() |
C.异面直线![]() ![]() |
D.直线![]() ![]() ![]() |
更新时间:2023-03-24 11:24:33
|
相似题推荐
多选题
|
适中
(0.65)
名校
解题方法
【推荐1】在正方体
中,
,
,
分别为
,
,
的中点,则( )
![](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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/8/eb7ede98-72b9-4190-a4c4-4ba63d0381ab.png?resizew=161)
A.直线![]() ![]() ![]() |
B.直线![]() ![]() |
C.若正方体棱长为1,三棱锥![]() ![]() |
D.点![]() ![]() ![]() ![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
【推荐2】蜂巢是由工蜂分泌蜂蜡建成的.从正面看,蜂巢口是由许多正六边形的中空柱状体连接而成,中空柱状体的底部是由三个全等的菱形面构成,菱形的一个角度是
,这样的设计含有深刻的数学原理.我国著名数学家华罗庚曾专门研究蜂巢的结构,著有《谈谈与蜂房结构有关的数学问题》,用数学的眼光去看蜂巢的结构,如图,在正六棱柱
的三个顶点
,
,
处分别用平面
,平面
,平面
截掉三个相等的三棱锥
,
,
,平面
,平面
,平面
交于点
,就形成了蜂巢的结构.
![](https://img.xkw.com/dksih/QBM/2021/7/7/2759014038994944/2778915673006080/STEM/650c2b2b-cfce-4ec5-8d04-97caea06a7b0.png?resizew=208)
![](https://img.xkw.com/dksih/QBM/2021/7/7/2759014038994944/2778915673006080/STEM/f287a8ab-288f-4ecd-8fbb-08951aa15b29.png?resizew=622)
如图,设平面
与正六边形底面所成的二面角的大小为
,则下列结论正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cadf7305c76ce730784b007d868d1f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/820d57f794b28a4997dd4dc4aa609cb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a1be205bf5955cb569d5eabde0eebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e648c9ff4284df8551f924e34e00c131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6895da13331cb525f5850d7b7a02a847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aede171b1554a3a945fefc3c122f900a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ce657e1534daf6c5e163895549a47c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f236b9f7b46ba33af145306f421173ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a1be205bf5955cb569d5eabde0eebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e648c9ff4284df8551f924e34e00c131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6895da13331cb525f5850d7b7a02a847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2021/7/7/2759014038994944/2778915673006080/STEM/650c2b2b-cfce-4ec5-8d04-97caea06a7b0.png?resizew=208)
![](https://img.xkw.com/dksih/QBM/2021/7/7/2759014038994944/2778915673006080/STEM/f287a8ab-288f-4ecd-8fbb-08951aa15b29.png?resizew=622)
如图,设平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/347337898d085eeaf541523302700271.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
A.异面直线![]() ![]() ![]() | B.![]() |
C.![]() ![]() ![]() ![]() | D.![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
解题方法
【推荐1】如图,边长为2的正方形ABCD中,E,F分别是AB,BC的中点,将
,
,
分别沿DE,DF,EF折起,使A,B,C重合于点P,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958580993482752/2961530900971520/STEM/c53fccf9-7439-48c0-8126-4187bfb8c3d1.png?resizew=164)
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958580993482752/2961530900971520/STEM/9abc3efb-7453-45ed-9297-bf1e77ca8a09.png?resizew=227)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958580993482752/2961530900971520/STEM/c53fccf9-7439-48c0-8126-4187bfb8c3d1.png?resizew=164)
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958580993482752/2961530900971520/STEM/9abc3efb-7453-45ed-9297-bf1e77ca8a09.png?resizew=227)
A.![]() | B.三棱锥![]() ![]() |
C.点P到平面DEF的距离为![]() | D.二面角![]() ![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
解题方法
【推荐2】在如图所示的几何体中,底面
是边长为4的正方形,
均与底面
垂直,且
,点
分别为线段
的中点,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/5/24/2728210509537280/2730267043217408/STEM/313ad2c504944e6c92e5f026807a5cf9.png?resizew=189)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d76e7575af4bc9e51b1045fc78aac8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5dcbac48b03ff784398c7d0155f2e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/334bd1a151c0a42ca813cb6b839ce45c.png)
![](https://img.xkw.com/dksih/QBM/2021/5/24/2728210509537280/2730267043217408/STEM/313ad2c504944e6c92e5f026807a5cf9.png?resizew=189)
A.直线![]() ![]() |
B.三棱锥![]() ![]() |
C.点![]() ![]() ![]() |
D.二面角![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在正方体
中,点
在线段
上运动,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
A.直线![]() ![]() |
B.点![]() ![]() |
C.异面直线![]() ![]() ![]() |
D.直线![]() ![]() ![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
名校
【推荐2】如图所示,在三棱锥
中,已知
,
,
两两互相垂直,
,
,M,N分别是边
,
的中点,点E是线段
上的动点,点F是平面
中的任意一点,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/26cd83ba-ff73-477d-b953-ce10943aab3b.png?resizew=165)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b30f41074484c00bc1bb78c281d8c56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/591b4069c5aadf7c11e20bfcee62d6d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89abfe070487c1296d855093aa9596e4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/26cd83ba-ff73-477d-b953-ce10943aab3b.png?resizew=165)
A.三棱锥![]() |
B.直线![]() ![]() ![]() |
C.三棱锥![]() ![]() |
D.当点E是线段![]() ![]() ![]() |
您最近一年使用:0次