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2 5个典型哥白尼纪撞击坑次级坑界限范围内的次级坑分布
Fig.2 Secondary crater distribution in the distribute range of the secondary craters about the five Copernican primary craters