轻轨“明珠线”的建成,缓解了徐家汇地区交通拥挤状况,请在图上画出拱形梁在A点的受力示意图,这种拱形桥的优点是________.(红笔是答案,是切线方向,我想问为什么,优点是跨度大,为什么)
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![轻轨“明珠线”的建成,缓解了徐家汇地区交通拥挤状况,请在图上画出拱形梁在A点的受力示意图,这种拱形桥的优点是________.(红笔是答案,是切线方向,我想问为什么,优点是跨度大,为什么)](/uploads/image/z/7442734-22-4.jpg?t=%E8%BD%BB%E8%BD%A8%E2%80%9C%E6%98%8E%E7%8F%A0%E7%BA%BF%E2%80%9D%E7%9A%84%E5%BB%BA%E6%88%90%2C%E7%BC%93%E8%A7%A3%E4%BA%86%E5%BE%90%E5%AE%B6%E6%B1%87%E5%9C%B0%E5%8C%BA%E4%BA%A4%E9%80%9A%E6%8B%A5%E6%8C%A4%E7%8A%B6%E5%86%B5%2C%E8%AF%B7%E5%9C%A8%E5%9B%BE%E4%B8%8A%E7%94%BB%E5%87%BA%E6%8B%B1%E5%BD%A2%E6%A2%81%E5%9C%A8A%E7%82%B9%E7%9A%84%E5%8F%97%E5%8A%9B%E7%A4%BA%E6%84%8F%E5%9B%BE%2C%E8%BF%99%E7%A7%8D%E6%8B%B1%E5%BD%A2%E6%A1%A5%E7%9A%84%E4%BC%98%E7%82%B9%E6%98%AF________.%EF%BC%88%E7%BA%A2%E7%AC%94%E6%98%AF%E7%AD%94%E6%A1%88%2C%E6%98%AF%E5%88%87%E7%BA%BF%E6%96%B9%E5%90%91%2C%E6%88%91%E6%83%B3%E9%97%AE%E4%B8%BA%E4%BB%80%E4%B9%88%2C%E4%BC%98%E7%82%B9%E6%98%AF%E8%B7%A8%E5%BA%A6%E5%A4%A7%2C%E4%B8%BA%E4%BB%80%E4%B9%88%EF%BC%89)
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