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:2017-07-26 10:29 │ 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 根据句意及首字母补全单词。1. Now my t _____ is tired because I have spoken English all morning. 2. Who is Li Ming's pen p_____ . 3. There is a p_____ standing at the bus stop. 4. "Stand"is a v_____ in English. 5. I want to learn a new l_____ . 6. We will c _____ pen friends. 7. He lives in an a _____ with his parents. 查看答案