Optimizing regional agriculture produce structure is very significative to increase the income of peasantry.

优化区域农业生产结构对于提高农民收入具有重要的现实意义。

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So it is significative and valuable to research and discuss structure behavior and calculate method of multi-box girder Bridges.

因此，研究和探讨这类桥梁的受力行为和设计计算方法具有重要的理论意义和工程实用价值。

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