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1 . 福建土楼是我国福建省独有特色的大型民居建筑,被联合国科教文组织列人《世界遗产名录》.已知一座圆环形土楼的高为12
,在太阳光的照射下,其内部形成如图所示的月牙形的阴影.若要求太阳光线与地面所成的角大于等于
时,其圆心
均能照射到阳光,则该土楼的内壁圆环半径至少为( )
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723948993544192/2734951911063552/STEM/186ff866-e26a-496a-9461-3abd7585147c.png?resizew=286)
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723948993544192/2734951911063552/STEM/d4dcf44f-e708-420b-ba0a-f4e663077489.png?resizew=175)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723948993544192/2734951911063552/STEM/186ff866-e26a-496a-9461-3abd7585147c.png?resizew=286)
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723948993544192/2734951911063552/STEM/d4dcf44f-e708-420b-ba0a-f4e663077489.png?resizew=175)
A.12 | B.![]() | C.24 | D.![]() |
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2021-06-07更新
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356次组卷
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2卷引用:河南省商丘市第一高级中学2020-2021学年高三5月月考理科数学试题