解题方法
1 . 已知边长为
的菱形
中,
,
为
边的中点,将
沿对角线
翻折,在翻折过程中,记直线
与
所成的角为
.当平面
平面
时,
( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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2021-12-01更新
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