重力勘查工作中基于大样法的松散沉积层密度测定方法的改进
耿涛, 冯凡, 杜辉, 冯治汉, 郭培虹

The improvement of density measurement method of loose sedimentary based on large sample method in gravity survey
GENG Tao, FENG Fan, DU Hui, FENG Zhi-Han, GUO Pei-Hong
图6 平行六面体可分割为六个相等的四面体
Fig.6 A parallelepiped can be divided into six equal tetrahedrons