拦洪坝的横截面为梯形ABCD,已知上底BC=5cm,迎水面坡度i1=1:根号3,背水面坡度为i2=1:1,坝高为4m(1)求下底AD的长(精确到1m(2)迎水坡CD的长(3)坡角阿勒发和β
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![拦洪坝的横截面为梯形ABCD,已知上底BC=5cm,迎水面坡度i1=1:根号3,背水面坡度为i2=1:1,坝高为4m(1)求下底AD的长(精确到1m(2)迎水坡CD的长(3)坡角阿勒发和β](/uploads/image/z/9590350-22-0.jpg?t=%E6%8B%A6%E6%B4%AA%E5%9D%9D%E7%9A%84%E6%A8%AA%E6%88%AA%E9%9D%A2%E4%B8%BA%E6%A2%AF%E5%BD%A2ABCD%2C%E5%B7%B2%E7%9F%A5%E4%B8%8A%E5%BA%95BC%3D5cm%2C%E8%BF%8E%E6%B0%B4%E9%9D%A2%E5%9D%A1%E5%BA%A6i1%3D1%3A%E6%A0%B9%E5%8F%B73%2C%E8%83%8C%E6%B0%B4%E9%9D%A2%E5%9D%A1%E5%BA%A6%E4%B8%BAi2%3D1%3A1%2C%E5%9D%9D%E9%AB%98%E4%B8%BA4m%EF%BC%881%EF%BC%89%E6%B1%82%E4%B8%8B%E5%BA%95AD%E7%9A%84%E9%95%BF%EF%BC%88%E7%B2%BE%E7%A1%AE%E5%88%B01m%282%29%E8%BF%8E%E6%B0%B4%E5%9D%A1CD%E7%9A%84%E9%95%BF%EF%BC%883%EF%BC%89%E5%9D%A1%E8%A7%92%E9%98%BF%E5%8B%92%E5%8F%91%E5%92%8C%CE%B2)
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