单词：invertible morphism
可逆态射
单词：invertible morphism 相关文章
And the icy grains on the Saturnian beaches are washed by passing traffic. When a moon comes by, it creates a wake just like a motor boat creates a wake that goes behind it. And I kind of imagine the ring particles doing an intricate cosmic dance aro
发表于:2019-01-22 / 阅读(56) / 评论(0)
自然百科2012年
自然百科2012年