原子核經放射性衰變①變?yōu)樵雍?img src="https://newimg.ppkao.com/2016-03/yinzhangbing/2016030114460297458.jpg" />，繼而經放射性衰變②變?yōu)樵雍?img src="https://newimg.ppkao.com/2016-03/yinzhangbing/2016030114463431154.jpg" />，再經放射性衰變③變?yōu)樵雍?img src="https://newimg.ppkao.com/2016-03/yinzhangbing/2016030114470181064.jpg" />。放射性衰變①、②和③依次為（）。
經放射性衰變①變?yōu)樵雍?img src="https://newimg.ppkao.com/2016-03/yinzhangbing/2016030114460297458.jpg" />，繼而經放射性衰變②變?yōu)樵雍?img src="https://newimg.ppkao.com/2016-03/yinzhangbing/2016030114463431154.jpg" />，再經放射性衰變③變?yōu)樵雍?img src="https://newimg.ppkao.com/2016-03/yinzhangbing/2016030114470181064.jpg" />。放射性衰變①、②和③依次為（）。