维基百科释义: An aftershock is a smaller earthquake that occurs after a previous large earthquake, in the same area of the main shock. If an aftershock is larger than the main shock, the aftershock is redesignated as the main shock and the original main shock is redesignated as a foreshock . ...
自然界丰度: O , Si , Al , Fe , Ca , Na , K , Mg , Ti , H 人体内丰度: O , C , H , N , Ca , P , K , S , Na , Al , Mg 元素丰度饼图,左面为地球范围内的丰度分布,右面为人体范围内的丰度分布 元素赋存方式 1. 形成化合物分子 ...