将一幅斜边长相等的直角三角板拼接成如图所示的空间图形,其中AD=BD=
,∠BAC=30°,若它们的斜边AB重合,让三角板ABD以AB为轴转动,则下列说法正确的是_________ .
![](https://img.xkw.com/dksih/QBM/2013/2/20/1571111348764672/1571111354236928/STEM/00e9aa4ef4854d46953eca6d61bdb950.png?resizew=151)
①当平面ABD⊥平面ABC时,C、D两点间的距离为
;
②在三角板ABD转动过程中,总有AB⊥CD;
③在三角板ABD转动过程中,三棱锥D-ABC体积的最大值为
.
![](https://img.xkw.com/dksih/QBM/2013/2/20/1571111348764672/1571111354236928/STEM/d41a54f94f4f43638321c9a81454e89f.png?resizew=23)
![](https://img.xkw.com/dksih/QBM/2013/2/20/1571111348764672/1571111354236928/STEM/00e9aa4ef4854d46953eca6d61bdb950.png?resizew=151)
①当平面ABD⊥平面ABC时,C、D两点间的距离为
![](https://img.xkw.com/dksih/QBM/2013/2/20/1571111348764672/1571111354236928/STEM/d41a54f94f4f43638321c9a81454e89f.png?resizew=23)
②在三角板ABD转动过程中,总有AB⊥CD;
③在三角板ABD转动过程中,三棱锥D-ABC体积的最大值为
![](https://img.xkw.com/dksih/QBM/2013/2/20/1571111348764672/1571111354236928/STEM/6737122214c74ed7b746e8819504ae52.png?resizew=24)
13-14高一上·福建福州·期末 查看更多[2]
更新时间:2016-12-02 03:37:08
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