By very elementary method, it is proved that every continuous differentiable function defined in a perfect set has differentiable extension.
本文完全用初等的方法证明了完全集上连续可微函数都有可微开拓。
The method adopted in this paper is definite in mechanical concept, and it is the extension of elastic analysis, it can be widely used in shear lag effect analysis of cracked continuous box girder.
本文方法力学概念明确，是其弹性分析适用范围的拓展，可广泛应用于连续箱梁开裂后的剪力滞效应分析。
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