A:烛焰随着声音节奏晃动
B:电流周围存在磁场
C:水流使水轮机转动电流使灯泡发光
D:验证电磁波的存在
人体主要由八大系统组成的,其中对生命活动具有调节作用的两大系统分别是____和____.
读下图,回答问题。
These pictures show the of life. Who them?
— Is _______ possible that everyone likes the same clothes?
— No, I don't think so.