名校
1 . 矩形
中,
,
是线段
上的点,将
沿
折起,得到
,使得平面
平面
,则当
,
与平面
所成角相等时,
的长度等于( )
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A.![]() | B.![]() |
C.![]() | D.![]() |
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2021-11-04更新
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7卷引用:浙江省舟山市普陀中学2022届高三下学期3月月考数学试题
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