陕西省2023-2024学年度第二学期八年级课后综合作业（一）A数学.考卷答案试卷答案,我们目前收集并整理关于陕西省2023-2024学年度第二学期八年级课后综合作业（一）A数学.考卷答案得系列试题及其答案，更多试题答案请关注微信公众号：考不凡/直接访问www.kaobufan.com(考不凡)
陕西省2023-2024学年度第二学期八年级课后综合作业（一）A数学.考卷答案试卷答案
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eachotherbyradio...-..Televisionisanotherimportant.invention..Itletsusseeaswellasheartheactor.Sinceitwasinvented,TVhasdoneagreatdealinthedaily:life.ofpeopleeverywhere.ManyprogramsarenowtelevisedonTV.Perhapsthemostmoderninventionis"Telstar",a"star"movingroundtheearth.Itmakesitpossibleforthepeopleallovertheworldtobecloser.thanever.before.NowonTVafamilyinChicagocanwatchamotorcarraceinItaly,atabletenniscompetitioninBeijing.oravolleyballmatchinJapanastheseeventsareactuallyhappening!67.Howmanykindsofinventionsdoesthewritermentioninthearticle?A.One.B.Two...C.Three.D.Four.68.WhenthewriterintroducesMarconiinthefirstparagraph,hemeansA.heisjustanItalianinventorB.hisinventionhasdonemuchfortheworldC.hereportedmuchtopeopleallovertheworldD.hehelpedpeopletravelalotaroundtheworld69.Whatis"Telstar"usedtodoaccordingtothe.passage?A.Toreceiveandstoreinformation..B.Tomovearoundtheearthjustlikethemoon.C.Togivelighttotheearthatnight.D.TohelpsendradioorTVinformationtotheworld.EChinahasarichandcolorfulculturalhistory,andmaskshaveplayedamajorroleinChinesetraditioninthousandsofyears.Whydopeoplewearmasks?Thereasonsaretoprotecttheirbody,tohidethemselves,ortodosomeamusement.Infact,masksareusedallovertheworld.Africanmasksareusuallymadebyatraditionalstyle.TherearemanydifferentkindsofAfricanmasks,butmanyofthemrepresentanimals.Africanmasksareapartoffull-bodycostumesandtheyaremadefordancers.Thedancersusuallywearthemasksinreligiousevents.Japanesemaskshavebeenusedinmanydifferentperformancessuchasdance,theater,festivalsorreligiousevents.Theyrepresentheroes,devils,ghosts,orsomeanimalsintheperformances.Mostofthemaremadeofclay,cloth,wood,orsomepaper.Greekmasksareusedtorepresentthespiritsofnatureduringreligiousevents.Also,theateractorsusemaskstoshowdifferentcharacters.In.Rome,devilandothermasksareusedincarnivals(节日).Today,maskscontinuetobeofgreatartisticentertainingvalue.70.WhatdomostAfricanmasksrepresent?A.Humans.B.Animals.C.Plants.D.Stones.71.Whatmaterialsareusedtomakemasks?A.Waterandsand.B.Foodandpaper.C.Clayandcloth.D.Metalandglass.72.ThisarticleisaboutA:variousmasksintheworldB.AfricanmasksC.reasonsforwearingmasksD.whentowearmasksF阅读下而短文，并用英语回答问题（请注意每小题后面的词数要求）
Shadowpuppetry(皮影x戏)isanancientformofstory-telling(讲故事)andentertainmentinChina.IthasbeenanimportantpartofChineseculture.ShadowpuppetrydatesbacktotheHanDynasty,over2,000yearsago.WhenEmperor2022-2023学年安徽省九年级上学期阶段性质量监测（二】·英语{人教版】，第7页·共8页
15.(16分)如图所示,xOy坐标系中,第三象限存在沿x轴正方向的匀强电场,第四象限与z轴和y轴相切的半径为R的圆形区域内存在磁感应强度大小为B、方向垂直纸面向里的匀强磁场I,其边界与x轴的切点为P点。x轴上方存在垂直纸面向外,磁感应强度大小为12B的匀强磁场Ⅱ。在第三象限(一2R,一R)处存在粒子源,带正电粒子由粒子源无初速度释放后进人电场,在电场中加速后进入圆形磁场I,又恰好以垂直于x轴的方向经P点进入磁场Ⅱ,最后带电粒子都打到放置在x轴上的收集板上。带电粒子的比荷均为qm,不计粒子间的相互作用和粒子受到的重力。(1)求第三象限中匀强电场的电场强度大小E;(2)求带电粒子从粒子源到收集板运动的总时间t;(3)若粒子源在第三象限(-2R,-R2)处,带电粒子仍能打到放置在轴上的收集板上,求收集板的最小长度L。
