The redundancy item problem which is an important technical problem of generating symbolic network function is discussed.

对生成符号网络函数的重要技术问题——冗余项问题进行深入分析。

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For a long time, the technical craft in smooth the surface of the steel-bridge is still an important item for the engineers in all over the world.

长期以来，钢桥面铺装技术一直是国内外工程界关注的重要课题。

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