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25【标准答案】1[文])当(2)mn(3[章])2v6mn6qv[来]B(n=1、2、3[自]…)当离子在从O到[知]B的过程中运动2n[嘛]段圆弧时t=2o当[答]离子在从O到B的过[案]程中运动(2n-1[网])段圆弧时5√3L[文]t2=6【试题解析[章]】(1)设磁流体发[来]电机两极板之间的电[自]压稳定后为U,等离[知]子体的电荷量为则有[嘛]qvB=q离子在P[答]、Q间做匀速直线运[案]动的过程中oB2=[网]q,解得(2)设离[文]子射出板间电场时速[章]度大小为v根据动能[来]定理得qBh=m1[自]21离子在电场中做[知]类平抛运动,水平方[嘛]向做匀速直线运动,[答]则有v=cOS 30解得h=m(3[案])设x为离子在一、[网]四象限磁场中每次偏[文]转圆弧所对应的弦长[章],由运动的对称性可[来]知,离子能到达B点[自]需满足L=nx(n[知]=1、2、3…)设[嘛]离子的轨道半径为R[答],圆弧所对应的圆心[案]L=nx(n=1、[网]23…设离子的轨道[文]半径为R,圆弧所对[章]应的圆心L角为60[来]°,则有2Rsin[自]30°=x,可得R[知]=-,由洛伦兹力提[嘛]供向心力,有qv1[答]B3=m,R解得B[案]=23m(n=1,[网]2,3…),BaL[文]乙当离子在从O到B[章]的过程中运动2n段[来]圆弧时轨迹如图甲所[自]示,轨道半径R=离[知]子运动的总弧长S,[嘛]=2n2TR1,2[答]πR163离子在从[案]O到B的过程中运动[网](2n-1)段圆弧[文]时,运动轨迹如图乙[章]所示R2-(2n-[来]1)离子运动的总弧[自]长2R2S2=(2[知]n-1)2IRL,[嘛]则25√3πL6
第二节【写作提示】[答]1.审题:(1)明[案]确故事人物:本故事[网]中主要人物为蒙蒂;[文](2)厘清主要事件[章]:蒙蒂小时候随着做[来]驯马师的父亲四处奔[自]波,一次上课时,老[知]师要求学生们写一篇[嘛]关于梦想的文章,他[答]在文中写到他想要拥[案]有自己的马场,然而[网]老师却认为他的目标[文]不切实际,并要求他[章]重写。2.写作要点[来]:(1)蒙蒂回去思[自]考是否要重写文章以[知]及是否放弃老师所谓[嘛]的“不切实际的”梦[答]想;(2)20年后[案]蒙蒂实现了老师眼中[网]“不切实际的”梦想[文],老师大为吃惊,但[章]也就此鼓舞学生向蒙[来]蒂学习,努力追求自[自]己的梦想。参考范文[知]】The boy went home and thought about it long and hard. Havingnot[嘛]iced the slight differenc[答]e in Monty, his father accompani[案]ed the littleboy[网] without any word until he asked in a low voice, Dad, have you everchang[文]ed your dream? Noticing the confusion[章] on the young face, hisfather[来] said without hesitatio[自]n," Never, it is my treasure.[知] It suddenlyd[嘛]awned on Monty that compared with getting an F for the paper, he wouldmore[答] pained if he chose to give up on his dream. Making up his mindhe took his paper, and headed for the teacher. With determine[案]d eyesMonty[网] said, "I am sorry. I'd like to keep working at my dream.Twe[文]nty years later, the teacher brought 30 students to camp out on aranch for a week. Learning Monty was the rancher, she was numb withsurpr[章]ise. Wearing obvious guilt, she said to him, "Sorry for what I said atTwenty years later, the teacher brought 30 students to camp out on aranch for a week. Learning Monty was the rancher, she was numb withsurpr[来]ise. Wearing obvious guilt, she said to him, " Sorry for what I said atthat time. Monty replied with a smile, Actually,[自] I should thank you forlettin[知]g me know what my dream meant to me." When the tour was about toend, the teacher called the students together and said in an emotional[嘛] voiceKids[答], remember,[案] be brave to pursue your dreams regardles[网]s of the realistic[文]condition[章]s. When she finished the words, a clap came from behind. It wasfrom Monty And soon, the students joined him.【点评】该[来]范文围绕原文内容进[自]行了非常合理的续写[知],紧扣语境,与原文[嘛]逻辑紧密,详略得当[答]。第一段紧扣原文最[案]后一段中老师要求蒙[网]蒂重写一个实际点的[文]梦想,讲述了蒙蒂思[章]考自己的梦想是否如[来]老师所说是不切实际[自]的,并在最后通过与[知]父亲的谈话坚定了自[嘛]己的梦想。第二段则[答]紧承第一段内容,讲[案]述蒙蒂坚持并实现了[网]最初被老师认为不切[文]实际的梦想。文章通[章]过描述老师鼓舞其他[来]学生们要勇于追求自[自]己的梦想升华了文章[知]的主题。以上内容既[嘛]合理地对故事情节进[答]行了延续,又将整个[案]故事带入到一段十分[网]鼓舞人的情境中。此[文]外,该范文中不乏较[章]为高级的表达,如 without hesitatio[来]n, make up one' s mind,dete[自]rmined, be numb with surprise,[知] regardles[嘛]s of等高级词汇和短[答]语以及 It dawned on sh.tha.,定[案]句型、现在分词短语[网]作状语、when引[文]导的时间状语从句等[章]句式,使得文章语言[来]表达丰富优美。
