In simple tension experiment, the stress-strain relationship submits Hook's law within the limit of proportionality. 摘要单向拉伸试验中，在比例极限内，应力应变关系服从胡克定律。
As annotation, an equation of the relation between neutrons and protons in nuclei and its periodical solutions as well as atomic number limit are discussed. 作为诠释，探讨了原子核内中子与质子的趋势关系方程，以及其周期解和原子序数极限值。
