2.C【解析】由于A点的电场强度为0,点电荷在A点产生的电场强度方向水平向左,则薄板在A点产生的电场强度方向水平向右,薄板带负电,由于零电势点的选取是任意的,则电子在A点所具有的电势能不一定为0,A项错误;由薄板产生的场强对称性和电场的叠加原理可知OA段的平均场强小于OB段的平均场强,由U=Ed可知B、O两点间的电势差大于A、O两点间的电势差,B项错误;如果没有电荷量为+q的点电荷存在,则A、B两点电势相等,当有电荷量为+q的点电荷存在时,由于B点离电荷量为+q的点电荷更近,由电势叠加可知B点的电势更高,根据负电荷在电势高处电势能小,则电子在B点所具有的电势能小于在A点所具有的电势能,C项正确;由于A点的电场强度为0,则有E板=k9(3d)2kq根据对称性可知薄板产生的电场在B点的电场强度为a,D项错误。
短文改错:In recent years, marathons have hecome more popular hut many people trainfor month to run marathonsA marathon is a long-distance running event- usual about 42 kilometers.Many peoplething, running a marathon can help us stay healthy and make us much mere stronger. In additional, they can he enjoyable because A the heautiful sights along theadditionroute. that makes running a good way to relieve our stress. Moreover, we willwhichfeel mare confident after finish a marathonRunning can benefit ourselves in many ways and I will try my best to finish amarathon myself one day
以上就是2022七年级,广州市英语周报答案,更多英语周报答案请关注本网站。
本文地址: http://www.ncneedu.cn/post/14146.html
文章来源:admin
版权声明:除非特别标注,否则均为本站原创文章,转载时请以链接形式注明文章出处。
2023-04-05admin
2023-04-05admin
2023-04-05admin
2023-04-05admin
2023-04-05admin
2023-04-05admin
2023-02-24admin
2023-02-24admin
2023-02-24admin
2023-02-24admin
扫码二维码
获取最新动态