20222020届名校学术联盟押题卷理综九N答案

20222020届名校学术联盟押题卷理综九N答案，目前我们已经整理了20222020届名校学术联盟押题卷理综九N答案的各科答案和试卷，更多智慧上进请关注本网站。

第一节An activity named Earth Day 'Trade was held at 5 P. M.. on april 22 in our school to raise thestudents awareness of caring for the earthThe students actively took part in it and brought the stuff that they didn't need any more to theschool. Many old things were traded such as books, used electronic devices and so on. The studentswere glad that their old stutt wouldn t end up in trash cans but instead turned out useful to othersThe activity proved a big success, and the students involved realized that even small acts couldmake a diference to the earth

7.AC解析:本题考查静电场的特点。将正、负点电荷在B、D两点分别产生的电场的电场强度矢量叠加,可知B、D两点的电场强度大小相等、方向相同,A项正确;过O点作AC连线的垂线,在此垂线上各点的电势均为0,B点处的电势为正、D点处的电势为负,故B项错误、C项正确;因为B点的电势为g,根据对称性,可知D点的电势为-g,故电荷量为e的质子在D点的电势能为-egD项错误。