英语周报2022至2022学年高二外研版第27期答案

25.(1)粒子在电场中做类平抛运动,经过时间为t到达虚线边界上C点d=vbt(1分)L=a2,(1分)海,d·加速度a=9(1分)解得功=dzm(2分)(2)自A点经电场平抛,再经磁场回转,然后在电场中斜向上运动到最高点再平抛,如此循环,历经磁场n次回转,最终到达图示C点自A点平抛水平到达D1点速度为w,获得的竖直分速度为则有:v=22L(1分)粒子在磁场中运动半径为R,有:qUB="2(1分)R=-B(1分)D=2m、2E(1分)即前进OD1水平距离,就倒退D1D2距离,则有:d=OD1+2(n-1)OD1-nD1D2(2分)解得Ond+nDD2d2n-12n-1B(2n-1)V2mEL(2分)又OD1=nt(1分)√m(1分)际w)(,/E+2m2),以上各式中n取2,2ml分)

书面表达One possible version:Dear Mr. Smith.First of all, I would like to congratulate you on your school s sixtieth anniversary. The long history of theschool brings up its outstanding campus culture and educational concept. I take great pride in studying at thisexcellent school, At your invitation, I will perform a Chinese folk dance at the celebration ceremony to expressmy congratulations. Please prepare the audio equipment to play the accompanying music. I will prepare thedance music and costumes myself. I am delighted to be able to make a modest contribution to the promotion ofChinese culture and cultural exchanges between China and the UKBest wishes.Yours truly,Li Hu

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