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已知抛物线型拱桥的顶点距水面2米,测凉水面宽度为8米.当水面上升1米后,水面宽度...

已知抛物线型拱桥的顶点距水面2米,测凉水面宽度为8米.当水面上升1米后,水面宽度为     

 

米 【解析】略
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