1 . 如图所示,正方形
的边长为
,已知
,将
沿
边折起,折起后
点在平面
上的射影为
点,则翻折后的几何体中有如下描述:①
与
所成角的正切值为
;②
;③
;④平面
平面
,其中正确的命题序号为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4887473a8091e1ef53a169cc9f211e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7f2125dfe51596f77b060572f706cbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cff68ebaa9cd787e0476230c0567aae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0914b68f106a912420705b2f3928ca42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/289d7a880379d6060065c829b45b0ed6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/328917aeee0e2c8d3b2d31fe621ec3d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa9385d78c5ccd3b614e863b400f11aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfa640b17a9d7bfb7242f27fe0a4012a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
![](https://img.xkw.com/dksih/QBM/2018/1/14/1860313321455616/1862223197011968/STEM/f04ecac29ac34d6ab48500e1f40bb4cf.png?resizew=270)
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2018-01-17更新
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788次组卷
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5卷引用:甘肃省张掖市2017-2018学年高一上学期期末质量检测联考数学试题