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如图,在高为2m,坡角为30°的楼梯上铺地毯,地毯的长度至少应为( ) A.4m...
如图,在高为2m,坡角为30°的楼梯上铺地毯,地毯的长度至少应为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737361907346/SYS201311011927373619073007_ST/images0.png)
A.4m
B.6m
C.4
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737361907346/SYS201311011927373619073007_ST/0.png)
m
D.(2+2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737361907346/SYS201311011927373619073007_ST/1.png)
)m
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