1 . 如图,在棱长为1的正方体
中,点M,N分别在线段
和
上.则下列说法正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/9e35de85-7118-449c-971e-a1a93867016d.png?resizew=172)
A.![]() |
B.M,N为![]() ![]() ![]() ![]() ![]() |
C.存在无数条直线![]() ![]() |
D.四面体![]() ![]() |
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2 . 如图,正三棱柱
中,
,点
为
中点,点
为四边形
内(包含边界)的动点,则以下结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/1da9e026-013f-490d-ae32-f6e9a9bc1a8a.png?resizew=191)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373d267302e0fc66360b5ce375805494.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/1da9e026-013f-490d-ae32-f6e9a9bc1a8a.png?resizew=191)
A.![]() |
B.若![]() ![]() ![]() ![]() |
C.直线![]() ![]() |
D.若点![]() ![]() ![]() ![]() |
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