[今日更新]山西省2023~2024学年度七年级上学期阶段评估(二) 2L R-SHX.物理试卷答案

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9.Whatdoestheunderlinedword"lucrative"inparagraph4probablymean?A.deliciousB.affordableC.profitableD.nutritious10.What'sthemainproblemofcamelmilkinAfrica?-A.LowqualityC.AlackofmarketdemandB.HighpricesD.Alackofmarketingchannels11.WhataiddoesShariftaketothefutureofcamelmilk?A.Hehashisdoubts.C.Heshowshisexcitement.B.Hehasconfidenceinit.D.Heexpresseshisconcerns.Donwostraweriesideiceecmeoutofasupermarketbaningitaspobablyharvestedhenasotripe,immediatelyplacedinforairoeduckvofBythetimeitreachedthepateitmayhavebeepickedfortweeksTheerrywaspickedfromagardenminutesbeforebeingeaten.Thefirstonewillprobablytastelikeaslightlymushy(揿踏踏的)cucumberwithstrongsourflavors.Thesecondislikelytobesweet;theflavourwilllingerinthemouth,asthescentwillonthehands.Supermarketstrawberriesarenotentirelywithoutadvantages:theyareconvenientandavailableinthenorthernhemisphere()inFebruary.ButthetwoberriesdifferfromeachotherinthesamewaythathearingBach'sMassinBMinorinaconcerthalldiffersfromlisteningtoitonacassette()Thehome-grownfruitisaneatablecaseforcultivatingahomegarden.Somepeoplealwaysarguegardeningisawasteoftime.Plantingcool-weathergreens,asgardenersrsthenorth-eastofAmericaaenowdoing,csemmakeses.ConvenientolckesupermarkethevelablellweknmayplacessupplementedweekendsbyfamersmarketsButhesameousaidofcooking:cheapandgoodrestauratsaround,sowhybothertomakeyourownmeals?hatmisnersandsthemheproductorthepurpose.Itistruethatagardencanyieldpeasthattastelikethevibrant(生机勃勃的)，greenspring:ondfncmnhshtkthmeahththeasihyelpckhichneoherand.agarden,especiallythearlyyears,sietfrusrtipantthewrongcropsfortheirsoil.Squirrelshaveahabitofkmsbeansadomates,thenleavingherettootAndevenseason'sharvestbecauseofbadweather.Nomatter.TherealjoyofgardeningisthetimespentdoingitTheeepespeasrasithcookingtngbringnguplrenoralmostanythingwhilsnhekAardenermmreoaroundthefoodobutwithhandsinthedir,suroundedbyfamilyifthegardenishomehfriendsandneighboursinacommunitygarden.Togardenistoatentligeorish.inthegroundandaboveit.

(2)按图甲的实验电路正确连线,闭合开关S,调节电阻箱的阻值,使微安表的指针偏转到接近满刻度,记下电流表的示数I0=500,A,,电压表的示数U0=9V,,断开开关S.同时开始每隔5s读取一次电流的值,并在如图乙所示的坐标系中用“×”描绘出了所测数据点,请在图乙中标注出放电瞬间的数据点并画出放电电流随时间的变化图线。

8.如图所示,高度为h的长方体平台与倾角为θ的斜面体都固定在水平地面上,长方体和斜面体的下端紧挨在一起,让质量为m的小球以不同的水平初速度离开平台。已知=2,重力加速度大小为g,不计空气阻力,则小球刚要落到斜面上时动能的最小值为A.14mghB.12mghC.mghD.2mgh

4.如图所示,在竖直墙壁上有一个可以上下移动的小球抛射装置,水平地面上距墙角d处有一小洞,改变小球抛射装置的高度及弹簧的弹性势能,使质量为m的小球水平抛出后,直接落入洞中时的动能最小,重力加速度大小为g。下列说法正确的是A.小球抛射装置的高度为dB.小球水平抛出时的动能为ngdC.小球落入小洞时的速度大小为gdD.小球从抛出到落人洞中的时间为dg