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一根圆柱形钢管，长30厘米，外直径是长的，管壁厚1厘米，已知每立方厘米的钢重7.8克，这根钢管重多少千克？
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把一根圆柱形木材对半锯开长300厘米宽40厘米．求这半根木材的表面积和体积．
一根圆柱形钢筋长30厘米直径是长的已知每立方厘米的钢重7.8克这根钢筋重多少克
把一根长12厘米的吸管放人一个圆柱形杯子吸管至少可露出杯子边缘2厘米最多能露出4厘米则这个玻璃杯的容
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把50个底面直径都是30厘米高20厘米的圆锥形钢坯熔铸成一根底面直径是60厘米的圆柱形钢材．求钢材长
一根圆柱形木料底面积为75平方厘米长90厘米它的体积是多少
把一根100厘米长的圆柱形木棍截成两个短圆柱表面积增加了16平方厘米原来这根圆柱形木棍的体积是立方
德鑫轧钢厂要把一种底面直径6厘米长1米的圆柱形钢锭轧制成长4.5米外径3厘米的无缝钢管如果不计加工过
0.25厘米
2厘米
1厘米
0.5厘米
在一个圆柱形储水桶中完全浸入一根底面半径是5厘米的圆柱形铁块水面上升9厘米如果把铁块竖直提出水面8
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一根圆柱形钢材长4米横截面的直径是2厘米每立方厘米钢重7.8克．这根钢材重多少克
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25.12
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一根圆柱形钢管长30厘米外直径是长的管壁厚1厘米已知每立方厘米的钢重7.8克这根钢管重多少克
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2018年3月广东某地报道了学生因误食网红玩具“史莱姆水晶泥”而中毒入院的新闻引发社会各界高度关注．“史莱姆水晶泥”含有硼酸钠Na2B4O7．请根据所学化学知识回答下列问题 1硼酸钠Na2B4O7在物质分类上属于填“酸”“碱”“盐”或“氧化物”． 2硼酸钠Na2B4O7中硼元素的化合价为价． 3如果误食“史莱姆水晶泥”硼酸钠会与胃酸作用产生有毒物质该过程属于变化填“物理”或“化学”．
以下实验设计合理的是 选项 实验目的 方案 A 除去KCl固体中混有的少量MnO2 加足量水溶解过滤蒸发 B 除去CaO中的CaCO3 滴加稀盐酸 C 鉴别K2SO4和NH4NO3 看外观 D 证明长期露置的NaOH溶液已变质 滴加无色酚酞试液
TheSecretstoHappiness Wealwayswanttoearnmoremoney.Nomatterhowmuchweearnitwon'tmakeushappier.36.Sowhatwillbringushappiness?Theansweris4things.These4thingshavebeenprovenbyresearch﹣surveysofmanypeopleaboutwhattheyhaveandhowhappytheyare.Heretheyare 1.Goodrelationships.37Havingsupportivefriendshipsastrongmarriageandlovingrelationshipswithourfamilieswillmakeusmuchmorelikelytobehappy.Sospendtimewithyourlovedonestellingthemwhattheymeantoyoulisteningtothemanddevelopingyourrelationshipwiththem. 2.Positivethinking.Positivethinkingisthebestwaytoachieveyourgoalsbutitturnsoutthatitcanleadtohappinesstoo.Optimismandself﹣esteemaresomeofthebestindicatorsofpeoplewholeadhappylives.38Makepositivethinkingahabitandreplaceallnegativethoughtswithpositiveones. 3.Flow.ThisisapopularconceptontheInternetthesedays﹣thestateweenterwhenwearecompletelyfocusedontheworkortasks.Wearesoimmersedinourtasksthatwelosetrackoftime.Havingworkandleisurethatgetsyouinthisstateofflowwillalmostundoubtedlyleadtohappiness.39Findworkandhobbiesthatyou'repassionateabout. 4.Generosity.Beinggenerousmeanstakingactiontowardothersandbeingsensitivetoothers'needsandwants. 40Yetgenerositydoesn'tjustbenefittherecipientofourofferings.Itnaturallyreducesstressandcombatsdepressionwhileenhancingoursenseofhappiness.Itcanevenlengthenourlifespan. A.Happinessdependsonpeople'sdifferentattitudestolife. B.Itinvolvesushelpingothersinwaysmatextendbeyondourselves. C.Wehaveahumanneedtobecloseandintimatewillotherhumanbeings. D.Thereisnogreaterhappinessthanthatofsucceedinginone'seducation. E.Insteaditcantakeusdecadesofpursuingwealth. F.Peoplefindgreatestenjoymentwhenthey'reabsorbedinamindfulchallenge. G.Happypeoplefeelempoweredincontroloftheirlivesandhaveapositiveoutlookonlife.
Growingupinoneofthepoorestmostcrime﹣riddencommunitiesbeingraisedbyasinglemotherwhodidn'tfinish3rdgradeandattendingthemostdysfunctional家庭不健全的publicschooldistrictIwasnotexpectedmuchbyothersandhadtoexpectsomethingofmyself. Onmy13thbirthdayIboughtaposterofHarvardtohanginmyroom.BeingatHarvardbecamewhatIdreamedaboutIsawmyselfattendingclassinSandersTheaterstudyinginWidenerLibraryandeatinginAnnenbergHall.EvenwhenmyelectricitywascutoffandIwokeupat530amtopitchblacknessIknewthatmyposterofHarvardwasstillhangingonlytwofeetawayfromme.I'dbeginmydaybyaskingmyselfthesetwoquestionsWhatdoIwantinmylife?andArethethingsIamdoingtodaygoingtogetmeclosertothatlife?. RemindingmyselfofmygoaleachdaymadeiteasytosaynotothesamechoicesIsawmypeersmaking.AskingmyselfthosequestionsgavemethecouragesoIcouldaskforfeedbackonmyapplicationessaysitgavemetheenergytostudyjustonemorehourwhenmyfriendswereasleepanditgavemethedeterminationtosubmitjustonemorescholarshipapplicationafterIhadalreadybeenturneddownmanytimes. EverydayIcouldfeelmyselfgettingclosertomygoalasmywritinggotbettermySATscoreincreasedandmyscholarshipchecksstartedcomingin.OnMarch31st2011anemailarrivedfromHarvard.ThefirstwordwasCongratulations!.AmonthlaterHarvardflewmeuptovisitthecampuswhereIgottoseeinsideSandersTheatertourWidenerLibraryandeatdinnerinAnnenbergHall. Whoyouaretodayistheresultofthedecisionsyoumadeyesterdayandwhoyouwillbetomorrowwillbetheresultofthechoicesyoumaketoday.Whodoyouwanttobetomorrow? 21.WhydidtheauthorhangaposterofHarvardinhisroom? A.Towarnhimselfnottowastetime. B.Tolearnmoreabouttheuniversity. C.Todecoratehisroom. D.Toremindhimselftofightforhisdream. 22.Paragraph3mainlytalksabout. A.thechoicestheauthormade B.howtheauthorstrivedforthegoal C.whattheauthorwantedtoget D.thedifficultiesinapplyingforscholarships 23.Whatwastheauthor'sfinalresult? A.HewasadmittedtoHarvard. B.HevisitedHarvard. C.HegotajobinHarvard. D.HemadeaspeechinHarvard. 24.Fromthispassagewecanlearnthat. A.allthatglittersisnotgold B.it'snevertoolatetomend C.timeandtidewaitfornoman D.nothingistoodifficultifyouputyourheartintoit.
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