题目

一根电阻丝，通过2C电荷量所消耗的电能是8J.若在相同的时间内通过4C的电荷量，该电阻丝上所加电压和消耗的电能各是（）A.4V  16J                  B.8V  16JC.4V  32J                  D.8V  32J 答案：D【试题分析】Dear MaryI saw your name in the newspaper, you asked for penfriends in China. I would like to be your penfriend.I am a thirteen- year- old boy. I live in Nanjing. I am a student at No.1 Secondary School. We study Chinese, English, Maths, Science, Art, PE and some other subjects. My favorite subjects are Maths and PE. I like playing the guitar, collecting stamps and taking photos. I like summer best because my favourite sport is swimming.My family is not big. My grandfather, my father, my mother, and I live a happy life here. My father is an engineer, my mother is a doctor. My grandfather was a policeman and now he is retired（退休）. We live in an old house. Near our house, there is a beautiful park. Our family often take a walk in the park after supper.I would like to know something about you and the UK. Please write to me soon. My e-mail address is yuren@163.com.My fax and telephone number is 86-25-82011853.Yu Run              Yu Run’s profileNameYu RunAge   【小题1】Telephone and fax number86-25-82011853【小题2】of the schoolNo.1Secondary School【小题3】subjectsMaths and P.E.HobbiesPlaying the guitar 【小题4】stamps and taking photos Favourite sportI like swimming【小题5】Favourite season【小题6】Family 【小题7】There are 【小题8】people in the family. Grandfather, father, and mother who works in a【小题9】【小题10】yuren@163.com