如图,正方体
的棱长为2,E,F分别为
,
的中点,则以下说法错误 的是( )
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629473603403776/2632620019998720/STEM/282bbf35-9edc-4b41-9169-4fd34dbe41fa.png?resizew=236)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629473603403776/2632620019998720/STEM/282bbf35-9edc-4b41-9169-4fd34dbe41fa.png?resizew=236)
A.N为![]() ![]() ![]() |
B.![]() ![]() ![]() |
C.三棱锥![]() ![]() |
D.![]() ![]() |
更新时间:2021-01-09 21:42:03
|
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【推荐1】西流湖公园今年春天成为了网红打卡地,公园里不仅有美丽的景色,各种亭台楼阁也是各有特色.十字歇山顶是中国古代建筑屋顶的经典样式之一,图1中的角楼的顶部即为十字歇山顶.其上部可视为由两个相同的直三棱柱交叠而成的几何体(图2).这两个直三棱柱有一个公共侧面
.在底面
中,若
,
,则该几何体的体积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbbf9291bb1b41ee3bf0d41f81f51dce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84ee8de2d272e8a3cad423ef206cd7eb.png)
A.88 | B.![]() | C.64 | D.![]() |
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【推荐2】如图,在棱长为1的正方体
中,
、
、
分别为线段
、
、
的中点,下述四个结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/a5b5022d-9fc2-4f14-9073-13d7c438ddb1.png?resizew=167)
①直线
、
、
共点;
②直线
、
为异面直线;
③四面体
的体积为
;
④线段
上存在一点
使得直线
平面
.
其中所有正确结论的序号为( )
![](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/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/a5b5022d-9fc2-4f14-9073-13d7c438ddb1.png?resizew=167)
①直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ad8115387158c8dda205d26968ba11.png)
③四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d7abf02717d6e59d8a64a65a87c412.png)
④线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31c34b18525831f3eda7bb90be0199b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae39b47a4da24a0647620f09fd0029c0.png)
其中所有正确结论的序号为( )
A.①④ | B.①② | C.①③ | D.①②③ |
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【推荐1】在三棱锥
中,
平面
分别是
的中点,则
与平面
所成的角等于( )
![](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/08e57c3f26375890f419d2b422121a70.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】在三棱锥
中,顶点P在底面的射影为
的垂心O(O在
内部),且
中点为M,过
作平行于
的截面
,过
作平行于
的截面
,记
,
与底面
所成的锐二面角分别为
,
,若
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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A.![]() | B.1 | C.![]() | D.![]() |
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【推荐1】如图,在正方体
中,O是正方形
的中心,E、F分别为棱AB、
的中点,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/0994f8a0-3502-4eb7-b8a5-538e336e0904.png?resizew=144)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efae13e09890f0d9e0603119271172ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/0994f8a0-3502-4eb7-b8a5-538e336e0904.png?resizew=144)
A.直线EF与![]() | B.![]() |
C.平面![]() ![]() | D.OF与![]() ![]() |
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【推荐2】一个圆锥被过顶点的平面截去一部分,余下几何体的三视图如图所示,则该几何体的侧面积是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/01fc7491-278e-4d7e-9bc6-e44bdbbe4bef.png?resizew=182)
A.![]() | B.![]() | C.![]() | D.![]() |
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