非凡吉创22届高三年级模拟调研(五)5理科综合答案

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20.CD(解析：带电微粒在竖直平面内做匀速圆周运动，则电场力与重力平衡，因此mg=Eg,解得E=m,方向竖直向上，故选q项A错误：微粒带正电且做逆时针方向的匀速圆周运动，由左手定则知，磁感应强度方向水平并垂直纸面向里，故选项B错误；该微粒运动的周期为T=2πmgB从P点运动到更高点所用时间为1=3T=,故选项C正确；设粒子做匀速圆周运动的轨84gB道半径为R,有9=m太，更高点与地面的距离为。=H+R(1+c0s45),解得。=H+(1+马,故选项D正确.)

书面表达One possible version:Dear PeterI'm writing to invite you to attend a lecture about exercise and health in our schoolAs you know, there are many students who are overweight or short-sighted in our school. They devote all their energy to studying andignore exercise. As a result, they are not so strong and healthy as they should be. Besides, some girls choose to keep slim by controlling thdiet, which also affects their health. So we hope to promote some health knowledge through this lecture: The lecture, which is to be held in theschool hall next Friday afternoon, will last from 3: 00 pm to 5: 00 pm. I hope you can attend it and share something with us.ooking forward to receiving your early replyYours sincerely