问题
选择题
| 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．  |
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答案
答案：D
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| 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． |
答案：D
完形填空 Hi! I’m Bill Read. I’m twelve years old. This is my ____1___. Her name is Jenny Read. ___2____ is 10 years old. We are ____3___the USA. But now we are in ___4_____. We are in the same school. But we are in different ____5___. My father is ___6____ English teacher and my mother is a doctor. ____7____work hard (努力地). At school I have a good ____8____. ____9_____ name is Ben. He’s twelve years old, __10___. He’s from England. We like China.
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