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(武汉科技大学2008年考研试题)如图4-51所示一矩形断面渠道，底宽为3m，在某处抬高0．3m，水深原来是2m，抬高后水面降低0．1m，流量为6m。／s。 (1)求1——1和2—2两断面间的水头损失。 (2)求水流对坎的冲击力。
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