如图所示,a、b、c三个闭合线圈,放在同一平面内,当a线圈中有电流I通过时,它们的磁通量分别为Ф_a、Ф_b、Ф_c下列说法中正确的是(      )

下图是羊字的各种写法演变，对于中国古代汉字表述正确的是（    ）

Dear friend,
    I am a girl from Beijing. I am a quiet girl. I like reading books. I want to be your friend. Now let me introduce my family to you. I have a good family. My father is tall and thin. He is a math teacher. My mother is a nurse. She likes reading books. My brother is a university student. I love my family very much. Welcome to my home.
                                                                                                                                                                                             Yours,
                                                                                                                                                                                               Li Xin