点C,D是平面
内的两个定点,
,点
在平面
的同一侧,且
,
,若
与平面
所成的角分别为
,则下列关于四面体ABCD的说法中,不正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb398137779190b35492d9f06d5fbc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ad5e80f5c405bbff96c529b641a6de2.png)
A.点A在空间中的运动轨迹是一个圆 | B.![]() |
C.四面体ABCD体积的最大值为![]() | D.当四面体ABCD的体积达最大时,其外接球的表面积为![]() |
更新时间:2021-05-06 17:44:10
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【推荐1】如图,矩形
中,
,
为边
的中点,沿
将
折起,点
折至
处(![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
平面
),若
为线段
的中点,则在
折起过程中,下列说法错误的是( )
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378575661563904/2380314942234624/STEM/aa01528d2dd64878a3bfee71b6ad03a8.png?resizew=210)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5203b16524b496a7272b5735aad23ce.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/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e581739cffb5676d997a58ab10d58880.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378575661563904/2380314942234624/STEM/aa01528d2dd64878a3bfee71b6ad03a8.png?resizew=210)
A.始终有![]() ![]() |
B.不存在某个位置,使得![]() ![]() ![]() |
C.三棱锥![]() ![]() |
D.一定存在某个位置,使得异面直线![]() ![]() ![]() |
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【推荐2】已知体积为
的正四棱锥
的所有顶点均在球
的球面上,则球
的表面积的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a391005600bdd69c96750589f9adb048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】已知三棱锥
的外接球半径为5,
,
,则三棱锥
的体积的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1033807076d59d5b26e1a07536688b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
A.48 | B.56 | C.64 | D.72 |
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【推荐2】三棱锥P-ABC中,平面PAC⊥平面ABC,AB⊥AC,PA=PC=AC=2,AB=4,则三棱锥P-ABC的外接球的表面积为( )
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】已知正方体
的棱长为1,E为
中点,F为棱CD上异于端点的动点,若平面BEF截该正方体所得的截面为四边形,则线段CF的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,
中,
,
,
,D为AB边上的中点,点M在线段BD(不含端点)上,将
沿CM向上折起至
,设平面
与平面ACM所成锐二面角为
,直线
与平面AMC所成角为
,直线MC与平面
所成角为
,则在翻折过程中,下列三个命题中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/4e8ca39b-a15d-4bc3-9bf3-19aa8ac465c2.png?resizew=201)
①
,②
,③
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f955e5cc9f108de6f3ca01e5eb84c52e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d2064e5fa0132978cd77e885f751a78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5037d6b2a2bc6c02966c59b0b15e5d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db4d98fca7b89bff24777242d0811de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3386a4f79f69e637de2f52cde97b236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/4e8ca39b-a15d-4bc3-9bf3-19aa8ac465c2.png?resizew=201)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28bfcafcd48a9b10f8ec9770cc07beed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5061ef5e792310437b88bd335139208a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92101a63decbda4268745869113e87c0.png)
A.① | B.①② | C.②③ | D.①③ |
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【推荐3】在
中,
,
,
.将
绕
旋转至另一位置
(点
转到点
),如图,
为
的中点,
为
的中点.若
,则
与平面
所成角的正弦值是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/27060827-a631-4547-8b87-b6003167c0a3.png?resizew=175)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10d461a7c0b86a2f09c2ea17f38260e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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