月球哥白尼纪次级坑的形态特征及其空间分布
张珂, 刘建忠, 程维明

Morphological features and spatial distribution of the lunar Copernican secondary craters
Ke ZHANG, Jianzhong LIU, Weiming CHENG
图3 距离主坑边缘的不同半径与次级坑直径关系
Fig.3 Relationship between the different radius from the main crater rim crest and secondary crater diameter