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倍力桥DIY科技小制作10倍力拱桥钢丝桥模型科普器材科学实验
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倍力桥课程课件
倍力桥(Bailey bridge),英国谢菲尔德大学工程师 Donald Bailey 于二次大战时期,为解决渡河的问题,利用预先设计好的钢架迅速组合而成的人工便桥。
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