如图,已知在棱长为1的正方体
中,M,N分别为线段
和
上的动点,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/3/2/2927641682624512/2929161401794560/STEM/c00cb932-33d5-4765-a208-7b78ac1e4e49.png?resizew=178)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://img.xkw.com/dksih/QBM/2022/3/2/2927641682624512/2929161401794560/STEM/c00cb932-33d5-4765-a208-7b78ac1e4e49.png?resizew=178)
A.MN与AB为异面直线 |
B.![]() |
C.三棱锥![]() ![]() |
D.当N为![]() ![]() |
更新时间:2022-03-04 20:57:02
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【推荐1】如图,在边长为3的正方体
中,
为
边的中点,下列结论正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/30/3a7f2a31-f170-4510-b420-fa2f4927bf65.png?resizew=158)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
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A.![]() ![]() ![]() |
B.过![]() ![]() ![]() |
C.![]() ![]() ![]() |
D.![]() ![]() ![]() ![]() ![]() ![]() |
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【推荐2】在长方体
中,
,
,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/6b56be7d-1007-4755-9a44-5fe992b44cb2.png?resizew=169)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37750daa8ba3b3fe3e9e2092f81c848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/6b56be7d-1007-4755-9a44-5fe992b44cb2.png?resizew=169)
A.![]() ![]() |
B.平面![]() ![]() |
C.三棱锥![]() |
D.直线![]() ![]() ![]() |
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【推荐1】如图,在矩形
中,点B,C,D与点
,
,
分别是线段
与
的四等分点,且
.若把矩形
卷成以
为母线的圆柱的侧面,使线段
,
重合,则( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5bb280919fefd301bcc544e9c7c65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bffa525a5cdd7df54b4ba1425831426.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5bb280919fefd301bcc544e9c7c65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a667900b37d61c8e5b86d2dca625283.png)
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A.直线![]() ![]() | B.直线![]() ![]() |
C.直线![]() ![]() | D.直线![]() ![]() |
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【推荐2】如图,在平行六面体
中,以顶点A为端点的三条棱长都为1,且
,则下列说法中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e5397259115cf10a944e669b4a1892.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/28/bf8aabc2-0e4e-4888-9697-6c487e9270b7.png?resizew=181)
A.异面直线![]() ![]() ![]() |
B.![]() |
C.![]() |
D.直线![]() ![]() |
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【推荐1】如图是四棱锥
的平面展开图,四边形
是矩形,
.在四棱锥
中,M为棱
上一点(不含端点),则下列说法正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/21/f29b188f-4f44-4285-939a-3a121327520c.png?resizew=185)
![](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/d2e0a20c9616658eadb94c25e93b3052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/21/f29b188f-4f44-4285-939a-3a121327520c.png?resizew=185)
A.![]() ![]() |
B.存在点M,使得![]() |
C.四棱锥![]() ![]() |
D.三棱锥![]() ![]() |
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【推荐2】正方体
中,P,Q,R分别是棱
,
,
的中点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
A.![]() | B.![]() ![]() |
C.![]() ![]() | D.平面![]() ![]() |
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【推荐1】如图,在正方体
中,点
是棱
的中点,点
是线段
上的一个动点.以下四个命题正确的为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/28/5d74020e-42f3-4248-9871-e764a65bc6dd.png?resizew=157)
A.异面直线![]() ![]() ![]() |
B.异面直线![]() ![]() |
C.三棱锥![]() |
D.直线![]() ![]() |
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【推荐2】如图1,扇形
的弧长为
,半径为
,线段
上有一动点
,弧
上一点
是弧的三等分点,现将该扇形卷成以
为顶点的圆锥,使得
和
重合,则在图2的圆锥中( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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A.圆锥的体积为![]() |
B.当![]() ![]() ![]() ![]() |
C.存在![]() ![]() |
D.![]() |
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