已知正方体
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
A.平面![]() ![]() | B.![]() ![]() |
C.![]() ![]() ![]() | D.![]() ![]() ![]() |
更新时间:2023-07-16 00:12:31
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【推荐1】在正方体
中,点
在线段
上运动,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
A.直线![]() ![]() |
B.三棱锥![]() |
C.异面直线![]() ![]() ![]() |
D.直线![]() ![]() ![]() |
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【推荐2】如图,在直三棱柱
中,
分别是棱
上的动点,
,
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969630cb6dc51ef586be9517ed70eb8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef0d66f9d6ea13506f065f43b6da251.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b17eedc143a07c66e9740ac76f02a61d.png)
A.直三棱柱![]() ![]() |
B.直三棱柱![]() ![]() |
C.若![]() ![]() ![]() ![]() ![]() |
D.![]() ![]() |
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【推荐1】如图,已知在正方体
中,
和
分别为
和
的中点,则( )
![](https://img.xkw.com/dksih/QBM/2023/3/9/3190651541356544/3191662526939136/STEM/d77c015163da4b558362ce3251d9d189.png?resizew=183)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e539f26ed5e0b20ff7220559324869a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://img.xkw.com/dksih/QBM/2023/3/9/3190651541356544/3191662526939136/STEM/d77c015163da4b558362ce3251d9d189.png?resizew=183)
A.直线![]() ![]() |
B.正方体![]() ![]() ![]() |
C.直线![]() ![]() |
D.平面![]() ![]() |
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【推荐2】在正方体
中,点P在正方形
内,且不在棱上,则下列说法错误的是( )
![](https://img.xkw.com/dksih/QBM/2021/12/6/2866805663883264/2874697880338432/STEM/338e389aea774ac790ba05d30a130db7.png?resizew=170)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://img.xkw.com/dksih/QBM/2021/12/6/2866805663883264/2874697880338432/STEM/338e389aea774ac790ba05d30a130db7.png?resizew=170)
A.在正方形![]() ![]() |
B.在正方形![]() ![]() |
C.在正方形![]() ![]() ![]() |
D.在正方形![]() ![]() ![]() |
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【推荐3】如图,在长方体
中,
,
,点E,F,G分别是
的中点,点M是侧面
内(含边界)的动点,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/4b13ee12-2a9c-4435-bbe1-80ca5ef56b1d.png?resizew=153)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3f5dd01b683fcab010fc6ff5558c9e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b2070d3881b08d3e4405a0981d44854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/4b13ee12-2a9c-4435-bbe1-80ca5ef56b1d.png?resizew=153)
A.存在M,使得![]() ![]() | B.存在M,使得![]() ![]() |
C.不存在M,使得平面![]() ![]() | D.不存在M,使得平面![]() ![]() |
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【推荐1】已知
是两条不相同的直线,
是两个不重合的平面,则下列命题为真命题的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
A.若![]() ![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() |
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【推荐2】已知正四棱锥
的底面边长为1,且侧棱长为
,点
,
分别为侧棱
,
上的动点,则下列结论中,正确的为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.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/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
A.![]() |
B.正四棱锥![]() ![]() |
C.若![]() ![]() ![]() |
D.正四棱锥![]() ![]() |
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【推荐1】已知正四棱锥
的底边长为2,高为2,且各个顶点都在球
的球面上,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
A.直线![]() ![]() ![]() |
B.平面![]() ![]() ![]() |
C.球![]() ![]() |
D.球心![]() ![]() ![]() |
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【推荐2】已知正方体
的棱长为3,P在棱
上,
为
的中点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0424446817f60c18f8e4e3cc202ad99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4818e676741d98793bfd0c496fe7cd39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
A.当![]() ![]() ![]() ![]() | B.当![]() ![]() ![]() |
C.三棱锥![]() | D.![]() ![]() ![]() |
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