如图所示,在正方体
中,E是棱
的中点,F是侧面
,(包含边界)内的动点,且
平面
,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/b92cdf16-398e-4e08-a30c-e54e09a0e594.png?resizew=166)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d45c10c00742e89d4123977720c0e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59375dfae3a8ec264204cfe78caac97d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/b92cdf16-398e-4e08-a30c-e54e09a0e594.png?resizew=166)
A.![]() | B.![]() ![]() |
C.DF不可能与平面![]() | D.三棱锥![]() |
更新时间:2021-05-03 19:51:24
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【推荐1】如图,在四棱锥
中,底面
是边长为2的正方形,
是正三角形,M为线段
的中点,点N为底面
内的动点,则下列结论正确的是
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A.若![]() ![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.若直线![]() ![]() ![]() |
D.若平面![]() ![]() ![]() ![]() |
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【推荐2】如图所示,在棱长为1的正方体
中,P、Q分别为线段
、
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![](https://img.xkw.com/dksih/QBM/2022/5/1/2970082166874112/2972816046268416/STEM/c1eabbe2cddf4873b97edcb61f77959f.png?resizew=180)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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A.存在点P、Q,使得![]() | B.三棱锥![]() |
C.直线![]() ![]() | D.![]() ![]() |
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【推荐3】如图,在棱长为1的正方体
中,
,
分别是
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df7fc746f8c4801d8f2f0471ba3297e.png)
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A.存在点![]() ![]() ![]() |
B.不存在点![]() ![]() |
C.直线![]() ![]() ![]() |
D.过![]() ![]() |
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【推荐1】如图,矩形BDEF所在平面与正方形ABCD所在平面互相垂直,
,
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/28/e5498267-7f18-40f1-b2fb-6f97a4de0c7a.png?resizew=164)
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A.存在点P,使得直线![]() |
B.存在点P,使得直线![]() |
C.直线DP与平面ABCD所成角的正弦值的取值范围是![]() |
D.三棱锥![]() ![]() |
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【推荐2】在直角梯形
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,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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A.![]() ![]() |
B.当![]() ![]() ![]() |
C.当![]() ![]() ![]() ![]() |
D.当![]() ![]() ![]() ![]() |
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【推荐1】已知圆锥PO的轴截面PAB是等腰直角三角形,
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A.点M的轨迹是半径为1的圆 | B.存在点M,使得![]() |
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【推荐2】如图所示,正方体
的棱长为
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、
、
分别为
、
、
的中点,则下列说法正确的是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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A.直线![]() ![]() |
B.直线![]() ![]() |
C.平面![]() ![]() |
D.点![]() ![]() ![]() |
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