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陕西省 2023~2024学年度第二学期八年级第二次阶段性作业(物理)试卷答案试卷答案
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30.WhatdoesSaladNthendathinkofhisname?A.Interesting.B.Meaningless.C.Important.D.Special.31.What'sthebesttitleforthetext?A.StoriesBehindSomeNamesB.SomeStrangeNamesinSouthernAfricaC.NamesinSouthernAfricaAreBothCreativeandMeaningfulD.One'sNameIsCloselyConnectedwithItsCountry'sHistory0Norainforestisexactlythesame-yetmostrainforestsarenowinthesmalllandarea23.26degreesnorthand23.26degreessouthoftheEquator(),betweentheTropicofCapricornandtheTropicofCancer.Youcanfindtropical(rainforestsinSouthAmericaandIndonesia.OtherrainforestsgrowwellfurtherfromtheEquator,inThailandandSriLanka.Despitecoveringarelativelysmallarea,rainforestshaveabigroletoplayinsupportingtheworld.Tropicalrainforestsarehometoarichvarietyofplants,food,birdsandanimals.CanyoubelievethatasinglebushintheamazonmayhavemorespeciesofantsthanthewholeofBritain?Fourhundredandeightyvarietiesoftreesmaybefoundinjustonehectareofrainforest.Rainforestsarethelungsoftheplanet-storinghugequantitiesofCOaandproducingalargeamountoftheworld'soxygen.Rainforestshavetheirownperfectsystemforensuringtheirownsurvival.Amazingly,thetreesgrowinsuchawaythattheirleavesandbranches,althoughclosetogether,neveractuallytouchthoseofanothertree.Scientiststhinkthisisadeliberate(waytopreventthespreadofanytreediseasesandmakelifemoredifficultforleaf-eatinginsectssuchascaterpillars.Tosurviveintheforest,animalsmustclimb,jumporfly.Thegroundflooroftheforestisnotalltangled(leavesandbushes,asinfilms,butisactuallyfairlyclear.Itiswhereleavesaredestroyedslowlyandturnedintofoodforthetreesandotherforestlife.Worryingly,rainforestsaroundtheworldaredisappearingatanalarmingrate,thankstodeforestation,riverpollutionandsoilerosion()aslandisbeinglostforagricultureandtreesarecutdownforwood.Afewthousandyearsago,tropicalrainforestscoveredasmuchas12percentofthelandsurfaceonEarth,buttodaythishasfallentolessthan7percent.Wecanonlyhopethattheworldgovernmentsworktogethertopreservetherainforests-beautifulandimportantforourexistence.32.What'sthemainideaofparagraph2?A.Theareaandhistoryofrainforests.B.Thefuturedevelopmentofrainforests.C.Rainforestsarethelungsoftheplanet.D.Rainforestsarehometoanimalsandplants.33.Howdorainforestsstoptreediseasesfromspreading?A.Theleavesoftwotreesnevertoucheachother.B.Therearefewleaf-eatinginsectsintherainforests.C.Theleavesandbranchesoftreesareclosetogether.D.Therichsoiloftherainforestshelpstreesgrow.34.Whatcanweknowaboutrainforests?A.Rainforestscoverarelativelylargearea.B.Rainforestsareunderproperprotectionnow.C.Rainforestsarethesameasdescribedinfilms.D.Rainforestscoverlessthan7percentofthelandsurfacenow.【高一英语第5页（共8页）】23117A
A.运动员从A运动到B加速度方向始终指向圆心A.运动运动员在B点时速度大小为15m/s15m/s/s所C运动在B点时所受圆弧轨道的支持力大小1500N00DB、C两点间的距离为42m2至有日AR
14.(12分)随着人们生活品质的不断提高,居室装修装饰也日新月异,各类建材被大量的开发和利用,而有的建筑材料中含有放射性物质氧,对室内环境造成严重的污染,Rn具有放射性,衰变后生成新核X,,同时释放出一个H,已知静止的管Rn衰变后放出的e动能为E,,假设释放的核能完全转化为新核X和Ie的动能,阿伏伽德罗常数为NA,,的半衰期约为4天.求:(1)若衰变后放出的He的速度与匀强磁场垂直,求新核X与He所做圆周运动的半径之比;(2)质量为1gRn经过8天,释放的核能为多少?
1.柔性电池被世界经济论坛评为“2023年十大新真技术”之首,3和柔性电池相关的柔性示屏,柔性传,性胡级电容等技术都取得了意大进医、中国空间站”天和”楼心菌次采用了大面积可暖收柔性太阳电治作为航天器的能量来,柔性太阳翼为空间站提俟120kπ功率的菌外电力,下列说法错误的是()A.一块"Ah'”的小薄胶电可以让定电流为1mA的电子标签工作1000小时B.两换柔性电论联和并联后正常工作时能供的总电能都是C.用煮针式多用电表侧柔性电的电动势时,一定要用表笔接电池的正极D.一个标有;5V,30P*的超级电容可储存的电萄
