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如图,已知一坡面的坡度i=1:,则坡角α为( ) A.15° B.20° C.3...
如图,已知一坡面的坡度i=1:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408136165651/SYS201311031014081361656007_ST/0.png)
,则坡角α为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408136165651/SYS201311031014081361656007_ST/images1.png)
A.15°
B.20°
C.30°
D.45°
考点分析:
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