如图(1)所示,三孔桥横截面的三个孔都呈抛物线形,两小孔形状,大小都相同.正常水位时大孔水面宽度AB=20m,如图(2)所示,顶点M距水面6m(即MO=6m),小孔顶点N距水面4.5m(即NC=4.5m).当水位上
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![如图(1)所示,三孔桥横截面的三个孔都呈抛物线形,两小孔形状,大小都相同.正常水位时大孔水面宽度AB=20m,如图(2)所示,顶点M距水面6m(即MO=6m),小孔顶点N距水面4.5m(即NC=4.5m).当水位上](/uploads/image/z/4985324-44-4.jpg?t=%E5%A6%82%E5%9B%BE%EF%BC%881%EF%BC%89%E6%89%80%E7%A4%BA%2C%E4%B8%89%E5%AD%94%E6%A1%A5%E6%A8%AA%E6%88%AA%E9%9D%A2%E7%9A%84%E4%B8%89%E4%B8%AA%E5%AD%94%E9%83%BD%E5%91%88%E6%8A%9B%E7%89%A9%E7%BA%BF%E5%BD%A2%2C%E4%B8%A4%E5%B0%8F%E5%AD%94%E5%BD%A2%E7%8A%B6%2C%E5%A4%A7%E5%B0%8F%E9%83%BD%E7%9B%B8%E5%90%8C.%E6%AD%A3%E5%B8%B8%E6%B0%B4%E4%BD%8D%E6%97%B6%E5%A4%A7%E5%AD%94%E6%B0%B4%E9%9D%A2%E5%AE%BD%E5%BA%A6AB%3D20m%2C%E5%A6%82%E5%9B%BE%EF%BC%882%EF%BC%89%E6%89%80%E7%A4%BA%2C%E9%A1%B6%E7%82%B9M%E8%B7%9D%E6%B0%B4%E9%9D%A26m%EF%BC%88%E5%8D%B3MO%3D6m%EF%BC%89%2C%E5%B0%8F%E5%AD%94%E9%A1%B6%E7%82%B9N%E8%B7%9D%E6%B0%B4%E9%9D%A24.5m%EF%BC%88%E5%8D%B3NC%3D4.5m%EF%BC%89.%E5%BD%93%E6%B0%B4%E4%BD%8D%E4%B8%8A)
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