铁路路基的横断面为等腰梯形,若腰的坡度为2∶3,顶宽是4m,路基高为5m,则路基的下底宽是( )A.7m B.19m C.12m D.15m"腰的坡度为2∶3"是什么意思?题中不是说是等腰三角形的么?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 04:44:20
![铁路路基的横断面为等腰梯形,若腰的坡度为2∶3,顶宽是4m,路基高为5m,则路基的下底宽是( )A.7m B.19m C.12m D.15m](/uploads/image/z/14578289-17-9.jpg?t=%E9%93%81%E8%B7%AF%E8%B7%AF%E5%9F%BA%E7%9A%84%E6%A8%AA%E6%96%AD%E9%9D%A2%E4%B8%BA%E7%AD%89%E8%85%B0%E6%A2%AF%E5%BD%A2%2C%E8%8B%A5%E8%85%B0%E7%9A%84%E5%9D%A1%E5%BA%A6%E4%B8%BA2%E2%88%B63%2C%E9%A1%B6%E5%AE%BD%E6%98%AF4m%2C%E8%B7%AF%E5%9F%BA%E9%AB%98%E4%B8%BA5m%2C%E5%88%99%E8%B7%AF%E5%9F%BA%E7%9A%84%E4%B8%8B%E5%BA%95%E5%AE%BD%E6%98%AF%EF%BC%88+%EF%BC%89A%EF%BC%8E7m+B%EF%BC%8E19m+C%EF%BC%8E12m+D%EF%BC%8E15m%22%E8%85%B0%E7%9A%84%E5%9D%A1%E5%BA%A6%E4%B8%BA2%E2%88%B63%22%E6%98%AF%E4%BB%80%E4%B9%88%E6%84%8F%E6%80%9D%EF%BC%9F%E9%A2%98%E4%B8%AD%E4%B8%8D%E6%98%AF%E8%AF%B4%E6%98%AF%E7%AD%89%E8%85%B0%E4%B8%89%E8%A7%92%E5%BD%A2%E7%9A%84%E4%B9%88%EF%BC%9F)
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