江西省九江市都昌县2023-2024学年度八年级下学期第二次阶段性学情评估试题(数学)试卷答案,我们目前收集并整理关于江西省九江市都昌县2023-2024学年度八年级下学期第二次阶段性学情评估试题(数学)得系列试题及其答案，更多试题答案请关注本网站↓↓↓
江西省九江市都昌县2023-2024学年度八年级下学期第二次阶段性学情评估试题(数学)试卷答案
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B.Ifcoded,theinformationwillbefreefromdanger.C.Androidiseasytoattackforlackofencryptionkeys.D.Alloftheinformationm27.WhatcanpcopledotoprotcctagainstKRACKattack?A.Purchasethebest-qualityapps.B.KeeptheproofofKRACKlong.D.InstallthelatestrelevantsoftwarcC.IgnorethepatchesofthecomputersWorkingatadeskalldaymaynotbeasbadforyourhealthassittinginfrontofatelevisionafterwork.ThatisafindingofanewstudydoneintheUnitedStates.Italsosuggeststhatnotallformsofsittingareequallybad.JeanctteGarciaworksasarescarcherattheUniversityofCentralFloridainOrlandoandsheledthestudy."We'vebeenhearingmoreandmoreabouthowsitingisthenewsmoking."shesaid.Sheaddedthatotherevidencesuggestsarelationshipbetweenhealthproblemsandtimespentsitting."However,it'sbeeunclearwhetherallsittingiscreatedequal,suggestingthataslongasyoureduceanytypeofsitting,thenthat'shelpfulinimprovinghealth,"sheadded."Thisstudysuggeststhatthismaynotbethecase,andthatweshouldfocusmoreonleisuretimesitting,mainlytelevisionviewingtime,ratherthanothersitting,ingeneral."Thestudyfollowedcloseto3,600African-Americanadults.AlmostonethirdofthemwatchedTVformorethanfourhoursaday.AlittlemorethanoncthirdofthesubjcetsspentbetweentwoandfourhoursadaysittinginfrontoftheTV.TheremainingthirdwatchedTVforlessthantwohoursaday.Researchersfollowedthegroupforanaverageof8.4years.Duringthestudy,205ofthesubjectsdiedand129otherssufferedaheartattackorstroke(中风)
Comparedtopeoplewhowatchedlessthantwohoursoftelevisiondaily,thosewhospentmorethanfourhoursinfrontoftheTVwere49percentmorelikelytodieorhaveaheartattackorstroke.ButtheundesirablehealtheffectsofwatchingTVappcaredtobelimitedtoadultswhofailedtogettherecommendedamountofweeklyexercise.Thatisaround150minutcsofmildphysicalactivityor75minutesofstrongexerciseeveryweek.Thcstudyhadsomelimitations,however.LinYang,anotherrescarcher,saysthatsittinginfrontoftheTVmightbeworsethansittingatadeskbecausepeoplesnackwhilewatchingTV.Somepeoplesimplystayuptoolateanddonotgetenoughsleep."Eatingtreatsorlackofsleepcouldbothcauseweightgainandincreaseriskfactorsforheartdisease.Thesefactorscouldmakepeoplemorelikelytodieearly,"sheadded.28.WhatcanwelearnfromJeanctteGarcia'sstudy?A.Allformsofsittingarecquallybad.B.Lesssittinghelpstoimprovehealth.C.Sittinglonghasthesameeffectassmoking.D.Healthproblemhasmuchtodowithworkingatadesk.29.Whichofthefollowingwillcausepeopletohavethehighestliferisks?A.WatchingTVlongandsnacking.B.ReadinginthestudyforfourhoursadayC.Failingtogetrecommendedamountofexercise.D.Having75minutesofstrongexerciseeveryweek.30.Whatshouldanadultdotoreducethehighriskoflife?A.Goondiets.B.Takeenoughexercise.
20.如图所示,不计重力的杠杆OB可绕O点转动,重为6N悬挂在杠杆的中点A处,拉力F1与杠杆成30^角,杠杆在水平位置保持平衡,以下说法正确的是(在直角三角形中,30^角所对的直角边长为斜边的一半)0A.物体p的重力就是该杠杆的阻力B.将力F1逆时针旋转90^,,最省力C.动力臂是阻力臂的2倍D.F1大小为6N三、实验题(每空2分,共22分)
