A:切洋葱时,人会流眼泪,是因为正丙硫醇分子在不断运动
B:正丙硫醇是一种有机化合物
C:正丙硫醇中碳元素与氢元素的原子个数比为3:7
D:正丙硫醇中碳元素与硫元素的质量比为9:8
This is a photo of my family . I'm John . I'm ten . My sister is seven . We are in the same school .My grandparents are Americans . My father is 42 .He is a driver . My mother is 40 . She is a teacher . We are very happy .