And the design approach of widening bridge and culvert is studied and summarized.

分别对桥梁加宽和通道、涵洞加长的设计方法进行了研究、总结，并提出了设计程序。

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And the design approach of widening bridge and culvert is studied and summarized.

分别对桥梁加宽和通道、涵洞加长的设计方法进行了研究、总结，并提出了设计程序。

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