解题方法
1 . 如图,正方体
边长为1,
是线段
的中点,
是线段
上的动点,下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/963da2cd-0de0-4cc5-bee1-cc295a06f2f9.png?resizew=152)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/963da2cd-0de0-4cc5-bee1-cc295a06f2f9.png?resizew=152)
A.![]() |
B.三棱锥![]() ![]() |
C.直线![]() ![]() ![]() |
D.直线![]() ![]() ![]() |
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