在神经纤维动作电位的去极相，哪种离子通透性最大（）。A.Na+ B.K+ C.Ca2 发布时间：2017-06-06 22:34 │ 来源：www.tikuol.com 题型：单项选择题 问题： 在神经纤维动作电位的去极相，哪种离子通透性最大（）。A.Na+B.K+C.Ca2+D.Mg2+E.Cl-
题型：单项选择题 完形填空。Dear Bob, My name is Zhang Jian, and I want 1 your pen pal. I live in Beijing, 2 . I think Canada is a very beautiful 3 . I' m 14 years old and my birthday is 4 September. I can 5 a little English. I have 6 brother or sister. I like to stay 7 my classmates. We often play 8 after school, such as football, basketball, tennis and running. My favorite 9 at school is maths. I don't like Engli8h. It' s too 10 . Let us be good pen pals. ( )1. A. be ( )2. A. Shanghai ( )3. A. country ( )4. A. on ( )5. A. speak ( )6. A. a ( )7. A. at ( )8. A. the guitar ( )9. A. color ( )10. A. difficult B. to be B. Singapore B. city B. at B. say B. some B. up B. soccer B. subject B. different C. to do C. China C. town C. of C. talk C. not C. for C. sports C. fruit C. easy D. to have D. Chinese D. village D. in D. tell D. no D. with D. with D. teacher D. interesting 查看答案