如图折叠一张长方形纸片,BC,BD为折痕,则∠CBD的度数为( )
![](https://img.xkw.com/dksih/QBM/2016/1/12/1573952103350272/1573952108527616/STEM/e147b0df186a4ed999bd20325f319bed.png)
![](https://img.xkw.com/dksih/QBM/2016/1/12/1573952103350272/1573952108527616/STEM/e147b0df186a4ed999bd20325f319bed.png)
A.60° | B.75° | C.90° | D.120° |
更新时间:2016-12-06 03:56:40
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【推荐1】把一张直径为2的半圆形纸片按如图所示方式折叠一次后展开,图中的虚线表示折痕,则
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,有一条长方形的宽纸带,按图折叠,则∠α=( )
![](https://img.xkw.com/dksih/QBM/2017/4/10/1662648805171200/1665091251412992/STEM/3abc348454804754921e82bf8f053652.png?resizew=152)
![](https://img.xkw.com/dksih/QBM/2017/4/10/1662648805171200/1665091251412992/STEM/3abc348454804754921e82bf8f053652.png?resizew=152)
A.30° | B.60° | C.70° | D.75° |
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