2022英语周报七年级新目标XAQ答案

【参考范文】To whom it ma concernI am one of your customers. I ordered a set of English short stories on your online store ofAmazon a month ago, but I didn't receive them until yesterday. And much to my disappointmentthe books were so poorly packed up that the package is broken and the cover of one book was tornTo make matters worse, it is not a complete set, for I found one book missingI am sorry to have received such poor service, and I believe I have every right to ask you todeal with this problem. I hope that you either return my money or deliver a new set of books to meBesides, I'd like to be informed of the process of your dealing with my complaintLooking forward to your reply.L

24.【解析】(1)PG、QG间的电场强度大小相等、方向相反设均强大小为E则有E=号一年(1分)粒子在PG间运动的加速度为a==(1分)此过程中粒子运动时间为则有h=2a(1分)在水平方向上的位移大小为x=vt(1分)联立解得x=(1分)(2)粒子穿过G时动能最大,根据动能定理可得qEhEk--mvd(2分)解得E=2m×2小(1分)(3)根据题意可知粒子穿过G两次从电场的右侧飞出,则金属板的长度最短(2分)根据对称性可知,此时金属板的长度为L=4x(2分)

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