2023·全国·模拟预测
1 . 如图,在长方体
,中,点
在平面
内的射影为
,则下列正确结论的序号为( )
①多面体
的外接球的表面积等于三棱锥
的外接球的表面积;
②点
为
的垂心;
③
﹔
④
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/5eefdbb1-b81d-4e81-aff7-808721253116.png?resizew=163)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
①多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb45fee1f7160ebdafe57dfcb5c4733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab9e8d0969ba6da74d8b5b6c1ad993e6.png)
②点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07c967c9b3f669ea78edd838e1d8b59e.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d93933a3d5c93d3ab98923ede672c63c.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a766babd7c8853cf4b1aacc68a563.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/5eefdbb1-b81d-4e81-aff7-808721253116.png?resizew=163)
A.①②④ | B.①② | C.①③④ | D.②④ |
您最近一年使用:0次
2 . 在正方体
中,
为棱
上的动点,
为线段
的中点.给出下列四个
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/9e0ce4c1-b69f-46c4-8a51-6d5eb2c46b80.png?resizew=202)
①
;
②直线
与平面
所成角不变;
③点
到直线
的距离不变;
④点
到
四点的距离相等.
其中,所有正确结论的序号为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9601d29de0a884953b039ee72f0158fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/9e0ce4c1-b69f-46c4-8a51-6d5eb2c46b80.png?resizew=202)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3681ff426cdbe7184eeb004ff0eaefb.png)
②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557f8ff92d79a9d464ff13de17f3eae7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdcfe69b939fd1c271747fe9d37ccdf9.png)
③点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
④点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef79576da8b2f423533a4bf60714f25f.png)
其中,所有正确结论的序号为( )
A.②③ | B.③④ |
C.①③④ | D.①②④ |
您最近一年使用:0次
2022-05-12更新
|
3205次组卷
|
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