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如图,铁路路基横断面为一个等腰梯形,若腰的坡度为i=2:3,顶宽是3米,路基高是...
如图,铁路路基横断面为一个等腰梯形,若腰的坡度为i=2:3,顶宽是3米,路基高是4米,则路基的下底宽是( )
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A.7米
B.9米
C.12米
D.15米
考点分析:
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