在棱长为2的正方体
中,
分别为
的中点,则下列判断正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ddef39ef9ed3da136c4ed8b5d28b73e.png)
A.![]() ![]() | B.点![]() ![]() ![]() |
C.三棱锥![]() | D.三棱锥![]() ![]() |
2023·全国·模拟预测 查看更多[2]
更新时间:2023-12-01 13:33:19
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【推荐1】如图,已知正方体
的棱长为
,则下列选项中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/30/b7271835-6bdd-4af4-b30b-ce108baf9221.png?resizew=168)
A.异面直线![]() ![]() ![]() |
B.二面角![]() ![]() |
C.正方体的外接球体积为![]() |
D.三棱锥![]() ![]() |
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【推荐2】在棱长为2的正方体
中,点M,N,P分别是线段
,线段
,线段
上的动点,且
.则下列说法正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/f13327ef-bd28-406f-8096-042fa813266f.png?resizew=176)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e97fcdcfd6183b976a61ef3222c607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/771764b4ccfe35b79337f7ce18331c4b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/f13327ef-bd28-406f-8096-042fa813266f.png?resizew=176)
A.![]() |
B.直线MN与AP所成的最大角为90° |
C.三棱锥![]() |
D.当四棱锥![]() ![]() |
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【推荐1】已知正三棱锥
的底面边长为6,侧棱长为
,则下列说法中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
A.侧棱![]() ![]() ![]() |
B.侧面![]() ![]() ![]() |
C.正三棱锥![]() ![]() |
D.正三棱锥![]() ![]() |
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【推荐2】在棱长为2的正方体
中,过
作一垂直于直线
的平面交平面
于直线l,动点M在直线l上,则( )
![](https://img.xkw.com/dksih/QBM/2022/5/17/2981466930077696/2983352951455744/STEM/7bc14d02-4261-4854-84b9-f813ca129606.png?resizew=179)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://img.xkw.com/dksih/QBM/2022/5/17/2981466930077696/2983352951455744/STEM/7bc14d02-4261-4854-84b9-f813ca129606.png?resizew=179)
A.![]() |
B.三棱锥![]() |
C.四棱锥![]() ![]() |
D.直线![]() ![]() ![]() |
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【推荐1】在四棱锥
中,底面
是正方形,
底面
,
,截面
与直线
平行,与
交于点
,则下列判断正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/6be2cf63-6c8f-44b4-9295-5264406558b2.png?resizew=166)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829f9180ddd9aa1a0ee0dc520f4e0b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/6be2cf63-6c8f-44b4-9295-5264406558b2.png?resizew=166)
A.![]() ![]() |
B.![]() ![]() ![]() |
C.![]() ![]() |
D.三棱锥![]() ![]() ![]() |
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【推荐2】如图所示,在棱长为1的正方体中
中,
分别为棱
,
的中点,则以下四个结论正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/7/7/2758940519964672/2778964662337536/STEM/789f33d7-e0aa-47ba-8c11-a0eabafe75c0.png?resizew=263)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://img.xkw.com/dksih/QBM/2021/7/7/2758940519964672/2778964662337536/STEM/789f33d7-e0aa-47ba-8c11-a0eabafe75c0.png?resizew=263)
A.![]() ![]() |
B.![]() ![]() |
C.异面直线![]() ![]() ![]() |
D.若![]() ![]() ![]() |
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【推荐3】如图,正方形
的边长为1,E,F分别是
,
的中点,
交EF于点D,现沿SE,SF及EF把这个正方形折成一个四面体,使
,
,
三点重合,重合后的点记为G,则在四面体
中必有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/a4318a90-b7c4-47c8-bf20-19271899d88e.png?resizew=152)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ac787c642466044d50f89d5dac41da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af9a10717d214e599ee121de74bf451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7a689d8c7a11bc48ef98d9415c1968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72ea2cb3843608a02c79e1d53285e975.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011ae6cb0cf49f6d3d19b485dc1cfc22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fda993d38532293724009685288b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a12119eba9da5c32568de5832ff04c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccde9ef0f2e9d12524e3f67fec439654.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/a4318a90-b7c4-47c8-bf20-19271899d88e.png?resizew=152)
A.![]() |
B.设线段SF的中点为H,则![]() |
C.四面体![]() ![]() |
D.四面体![]() ![]() |
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【推荐1】在棱长为1的正方体
中,点
,
分别满足
,
,其中
,
,则( )
![](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/10f322f8f148fbbaa38b6c0218ae68fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ba4237e3605176f48bd10d08f5edf5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e7e13498fcf482fb92fe0b84801fe52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e2e01346f60857ff635bb766802e57.png)
A.当![]() ![]() |
B.当![]() ![]() ![]() ![]() |
C.当![]() ![]() ![]() ![]() |
D.当![]() ![]() |
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【推荐2】已知三棱锥
的四个顶点都在球
的球面上,且
,
,球
的表面积为
,三棱锥
的体积为
,记点
到平面
的距离为
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45224f7eac9d0cef64bf28d93e7721a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9332278351ab92e03e984e9279dd06a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02dba908a505cff93e0b297d00b82a40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa3a310c1f8a5af35dc3328d874e18e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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