在匀强磁场中有一个原来静止的碳14原子核,它放射出的粒子与反冲核的径迹是两个相内 发布时间:2017-06-15 20:12 │ 来源:www.tikuol.com 题型:选择题 问题: 在匀强磁场中有一个原来静止的碳14原子核,它放射出的粒子与反冲核的径迹是两个相内切的圆,如图所示.那么碳14的衰变方程为( )A.+→B.→+C.+→D.→+
题型:选择题 用所给词的适当形式填空(5分)小题1:Look at the cloud in the sky. It ___________________ (rain).小题2:The college student often (fix) computers for his neighbours.小题3:Keep quiet! Our parents (plan ) a day to Hangzhou.小题4:Why not wait for him _____________(call) us back?小题5:She _____________(not check) your computer the day after tomorrow. She will be busy. 查看答案