本文提出了低温区高精度的禁带宽度的表达式，获得了低温区本征载流子浓度的简明公式。
A accurate expression for the bandgap and a simple formula for the intrinsic carrier concentration at low temperature are presented.
用灰色静态模型建立起计算裂缝密度的表达式，计算结果精度较高。
Based on the gray static model, fracture density expression are worked out, and the calculated conclusion have higher precision.
本文以极简单的数学推导，给出了正常重力垂直梯度的实用表达式，并对其精度作出了评价。
By very simple mathematical derivations, the practical expression of (Vzz), the expression of normal vertical gravity gradient, and the comment on the accuracy were given.
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