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
搜题请搜索小程序“爱下问搜题”
| 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． |
答案：D
根据句意，用方框中所给单词的适当形式填空。（每小题1分，共5分）。
小题1:Mr. Green spoke very loudly so that he could make himself___________ at the meeting. 小题2:There are many English ___________ in the world. They think speaking English is very popular. 小题3:Do you have any trouble _________ out this math problem . 小题4:Some people think it is__________ to ask someone’s age. 小题5:___________ English is not the same as oral English. |