名校
1 . 由四个三角形围成的多面体称为四面体,对棱相等的四面体称为等腰四面体.已知如图等腰四面体
中,
分别是棱
的中点.下面结论中,正确的有( )
![](https://img.xkw.com/dksih/QBM/2021/6/3/2735140570505216/2737932602081280/STEM/8b78dece-e8cc-49e2-89ae-07af16fa75ed.png?resizew=226)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0c52a2c840ba1755a2e3b4c09901af7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a337a934b801730321f67b0e5a0b144f.png)
![](https://img.xkw.com/dksih/QBM/2021/6/3/2735140570505216/2737932602081280/STEM/8b78dece-e8cc-49e2-89ae-07af16fa75ed.png?resizew=226)
A.直线![]() |
B.![]() |
C.过直线![]() |
D.特别地,当四面体棱长全相等时,共顶点![]() ![]() ![]() ![]() ![]() ![]() |
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