1 . 梯形
中,
,
沿着
翻折,使点
到点
处,得到三棱锥
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f397c464b549e55b962a28ebd4cc991.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/644f63756fe9251e65cc14e1ce9723d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
A.存在某个位置的点![]() ![]() ![]() |
B.若![]() ![]() ![]() ![]() ![]() ![]() |
C.若平面![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() |
您最近一年使用:0次
A.存在某个位置的点![]() ![]() ![]() |
B.若![]() ![]() ![]() ![]() ![]() ![]() |
C.若平面![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() |