已知正方体
的棱长为1,每条棱所在直线与平面α所成的角均为θ,平面α截此正方体所得截面为图形Ω,下列说法错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/19/4b29630d-ef7c-433f-be35-34a1103e4039.png?resizew=153)
A.平面α可以是平面![]() | B.![]() |
C.图形Ω可能是六边形 | D.![]() |
2023·四川·一模 查看更多[3]
更新时间:2023-08-18 14:56:27
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【推荐1】如图所示的几何体:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/d6fc9f84-13c4-4b7a-bbdd-e4c7585f6c29.png?resizew=497)
将它们按截面的形状分成两类时,下面分类方法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/d6fc9f84-13c4-4b7a-bbdd-e4c7585f6c29.png?resizew=497)
将它们按截面的形状分成两类时,下面分类方法正确的是( )
A.截面可能是圆和三角形两类 | B.截面可能是圆和四边形两类 |
C.截面可能是圆和五边形两类 | D.截面可能是三角形和四边形两类 |
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【推荐2】如图,在正方体
中,E,F分别为BC,
的中点,过点A,E,F作一截面,该截面将正方体分成上下两部分,则下部分几何体的正视图为( )
![](https://img.xkw.com/dksih/QBM/2022/2/28/2926051889496064/2929957392146432/STEM/c82a0d2706fe4b98ae63b920feea3df1.png?resizew=128)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/2022/2/28/2926051889496064/2929957392146432/STEM/c82a0d2706fe4b98ae63b920feea3df1.png?resizew=128)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,平面
平面
,
,AB与两平面
所成的角分别为
和
,过A,B分别作两平面交线的垂线,垂足为
,则
等于( )
![](https://img.xkw.com/dksih/QBM/2021/5/6/2715481583820800/2715803137703936/STEM/c2fa90098a7e4137aee1262cdf31aec3.png?resizew=185)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa807136194c18d3ac58902c67f9333.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735ef3d315886b4d9e8c40266fea638b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
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![](https://img.xkw.com/dksih/QBM/2021/5/6/2715481583820800/2715803137703936/STEM/c2fa90098a7e4137aee1262cdf31aec3.png?resizew=185)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在三棱锥
中,DA,DB,DC两两垂直,且长度均为1,E为BC中点,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/29/300c59a3-d945-4de9-b8e4-1a02a04270d8.png?resizew=147)
A.![]() |
B.![]() ![]() ![]() |
C.![]() ![]() |
D.![]() ![]() |
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【推荐1】在空间直角坐标系
中,经过点
且法向量为
的平面方程为
,经过点
且一个方向向量为
的直线
方程为
.已知:在空间直角坐标系
中,
,经过点
的平面
的方程为
,经过点
的直线
方程为
,则直线
与平面
所成角的正弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a834024400d0730af3e640ca4d5f54b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f643fa2143e08bfc78bb7bf9db886e17.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f643fa2143e08bfc78bb7bf9db886e17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494e3f517a51dbf10f28f7feb35f1ff6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b991a318d7250847af247a99cec749ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a834024400d0730af3e640ca4d5f54b4.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,已知正方体
的棱长为
,点
,
分别为
,
的中点,
在
上,且
,则直线
与平面
所成的角的正弦值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/c30a0abd-ca97-4688-8afa-1a4678399bc9.png?resizew=197)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e536121980c19a68f4e4d463ebd3b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1af39ac32939151e7f33b3139f31995f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/c30a0abd-ca97-4688-8afa-1a4678399bc9.png?resizew=197)
A.![]() | B.![]() | C.![]() | D.![]() |
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