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在△ABC中,∠C=90°, 则tan B的值为()。
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在Rt△ABC中若∠C.=90°tanA·tan20°=1则∠A.=.
如图在△ABC中∠BAC=90°AB=AC点D.为边AC的中点DE⊥BC于点E.连接BD则tan∠D
在△ABC中∠C=90°AC=4BC=2△ABC绕着点C旋转后点B落在AC边上的点B′点A落在点A
在△ABC中∠C.=90°∠
=50°,BC=4,则AC为( ) A.4tan50°
4tan40°
4sin50°
4sin40°
在Rt△ABC中∠C.=90°AC=8AB=10则tan∠ABC的值为
Ⅱ类砂宜用于强度等级为及有抗冻抗渗或其他要求的混凝土
G30~G60
C30~C70
C30~C80
C30~C90
.如图Rt△ABC中∠C.=90°BC=4AC=6现将△ABC沿ED翻折使点A.与点B.重合折痕为D
如图在Rt△ABC中∠C.=90°AM是BC边上的中线sin∠CAM=则tan∠B.的值为_____
在Rt△ABC中∠C.=90°BC=1AC=2则tan
的值为( ) A.2
在△ABC中∠C=90°AC=1BC=2△ABC绕着点B旋转后点C落在AB边上的点C′点A落在点A
如图在Rt△ABC中∠ACB=90°AC=8BC=6CD⊥AB垂足为D则tan∠BCD的值是.
已知Rt△ABC中∠C.=90°AC=6BC=8将它的一个锐角翻折使该锐角顶点落在其对边的中点D.处
如图在△ABC中∠ABC=90°AB=BC=1P.为△ABC内一点∠BPC=90°.Ⅰ若PB=求PA
已知在△ABC中∠C=90°BC=8AB=10点G为重心那么tan∠GCB的值为.
如图在Rt△ABC中∠C.=90°点D.在BC边上DC=AC=6求tan∠BAD的值.
混凝土结构设计规范GB50010—2002中所规定的混凝土强度等级为
C10~C80
C15~C80
C10~C90
C15~C90
在△ABC中∠C.=90°AC=4BC=2△ABC绕着点C.旋转后点B.落在AC边上的点B.’点A.
在Rt△ABC中∠ACD=90°CD⊥AB于D已知∠B=30°计算tan∠B+tan∠BCD的值.
已知在Rt△ABC中∠C=90°如果BC=2∠A=α则AC的长为
2sinα
2cosα
2tanα
2cotα
已知在Rt△ABC中∠C=90°如果cosA= 那么tanB的值为
A
B
C
D
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Annalivedonthesideofavalley山谷.OnewintertherewasaverybigfloodandalotofhousesdownbelowAnna’shousewerewashedaway.Anna’shousewashighenoughtoescapethefloodsowhenthewaterhaddisappearedandtheotherhouseswerestandingtherewithnoroofsandwallsandallcoveredwithmudherhousewasstillquiteallright.ThatyearAnna’swasverylucky. HerhousewasquitesmallandtherewereonlytwosmallbedroomsherhusbandwasdeadwhenthechildrenwereveryyoungandshehadfourchildrenbutAnnatookinoneofthefamiliesthathadlosteverythinginthefloodandshesharedherhomewiththemuntilitwaspossibleforthemtorebuildtheirhouse. Anna’sfriendswereverypuzzled困惑whentheysawAnnadothis.TheycouldnotunderstandwhyAnnawantedtogiveherselfsomuchmoreworkandtroublewhenshehadalreadyquitealotofchildrentosupport.Lifewouldbeevenharderwhenanotherfamilyjoinedthem. "Well"Annaexplainedtoherfriends"attheendoftheFirstWorldWarawomaninthetownwhereIthenlivedinGermanyfoundherselfverypoorbecauseherhusbandhadbeenkilledinthewarandshehadalotofchildrenasIhavenow." "ThedaybeforeChristmasthiswomansaidtoherchildren’Wewon’thavemuchforChristmasthisyearsoIamgoingtogetonlyonegiftforallofusandIamsurewewillallbegladtohaveit.NowI’llgoandgetit.’Shecamebackwithalittlegirlwhowasevenpoorerthantheyandwhohadnoparents.’Hereisourgift’shesaidtoherchildren." "Thechildrenwereveryexcitedandhappytogetsuchagift.TheywelcomedthelittlegirlandshegrewupastheirsisterIwasjustthatChristmasgift./ HowmanypeoplewerethereinAnna’sfamily
DearAmy IhaveaproblemandI’mwritingaskyou1. foranadvice.Thisisasecretsoldon’ttellanybodyelse.2. MycousinandIusedtogettingalongverywelland3. weweregoodfriend.Wewereplanningtospend4. partofthewinterholidaytogetherbutnow5. Idon’tthinkIwanttoinviteherhome.6. RecentlyIhasdiscoveredthathe’sstartedtotell7. lies.WhenItoldhimthiswaswrongtotelllies8. buthejustlaughedatme.TheproblemisshouldI9. tellhisparentsorhisteacherorshouldIkeepquietly.10. 第2空应
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D PeopleoftensaythattheEnglishman’shomeishiscastle.Theymeanthatthehomeisveryimportantandpersonaltohim.MostpeopleinBritainliveinhousesratherthanflatsandmanypeopleowntheirhomes.Thismeansthattheycanmakethemindividual个体的;theycanpaintthemandchangetheminanywaytheylike.Mosthouseshaveagardenevenifitisaverysmalloneandthegardenisusuallyloved.Thehouseandthegardenaretheprivate私人的spaceoftheindividual. Peopleusuallyliketomarktheirspace.AreyousittingnowinyourhomeoronatrainHaveyoumarkedthespacearoundyourselfasyoursIfyouareonthetrainyoumayputyourcoatorsmallbagontheseatbesideyou.Ifyoushareaflatyoumayhaveonecornerorchairwhichisyourown. OnceIwastravellingonatraintoLondon.Iwasinasectionforfourpeopleandtherewasatablebetweenus.Themanontheoppositesidetomehadhisbriefcaseonthetable.Therewasnospaceonmysideofthetableatall.Iwasangry.Maybehethoughtthatheownedthewholetable.IhadreadabookaboutnonverbalcommunicationsoItookvariouspapersoutofmybagandputthemonhisbriefcase!WhenIdidthishestiffenedandhiseyesnearlypopped瞪出outofhishead.Ihadinvaded侵犯hisspace!AfewminuteslaterItookmypapersoffhiscaseinordertoreadthem.Heimmediatelymovedhiscasetohissideofthetable.Ofcourseitispossiblethathejustwantedtobehelpfultome! Ifyouarevisitinganothercountryyoumayfeelthatyoudon’thaveanyprivatespace.Hotelroomslookmuchthesameineverycountryintheworld.Alldaylongyousharepublicspaceswithotherpeople.Youseethelocalpeopleintheirprivatespacesandyoufeellonelyand"outside".Localpeoplecancreatetheirprivatespacesbytalkingaboutthingsyoudon’tknowabout.Andyouevenfeelthattheylikeyoutobeoutsidethemsothattheywillenjoybeinginsideevenmore!Thisisoneofthedifficultiesofbeingatraveller!Butifyouunderstanditthenithelpsyou.Haven’tyouenjoyedbeingpartofagroupand"owning"abitofspace InParagraph4thepronounthemrefersto所指.
这是某学校通过校长意见箱收集到的一学生的意见和建议请阅读下文根据所提的信息完成下列表格 ZhangHongyinggirl15 Iwanttomakeourlunchtimelonger.Atthemomentlunchtimeisshort.Mostofmyclassmateswouldliketodotheirhomeworkduringthistime.Butiftheydon’tgetagoodresttheywon’thaveenoughenergyfortheafternoon.So1wouldliketohavemoretimeandhavetimetotakeanap午睡afterlunch.Thatwaywe’lllearnbetterintheafternoon. ZhaoPengrangirl15 IwouldliketohavemorechancestotalkinEnglish.NowtheEnglishclassesarenotenoughforustopracticespokenEnglish.Ithinkwe’dbetterhaveonemorningaweekatleasttohavespokenEnglishlessonsinordertoimproveourEnglish. ZhouJianchengboy15 Myideawouldbetohavemorefashionableschooluniforms.IfIweretheheadmasterIwouldaskthestudentstodesigntheuniformsthemselves.Wecouldhaveacontestamongstudentdesigners.Thenwecouldaskotherstochoosetheirfavorites.Thiswaywe’llbeabletowearwhatwelikebest.Howniceitwouldbeforusyoungpeople! InformationCard WhatwouldZhaoPengranliketodoinordertoimproveEnglishi 1. What’sZhouJiancheng’sidea 2. WhatwouldZhangHongyingliketodoafterlunch 3. Whatdomoststudentsdoduringlunchtime 4. Howoldarethestudents 5. 第2空应
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在小学数学教学过程中学生是
C OnChristmasEve—thenightbeforeChristmasDay—childrenalloverBritainputastockingattheendoftheirbedsbeforetheygotosleep.TheirparentsusuallytellthemthatFatherChristmaswillcomeduringthenight. FatherChristmasisverykind-hearted.Hegetstothetopofeachhouseandclimbsdownthechimneyintothefireplace.HefillseachofthestockingswithChristmaspresents. OfcourseFatherChristmasisn’treal.InJimandKate’shouse"FatherChristmas"isreallyMr.Green.Mr.Greendoesn’tclimbdownthechimney.Hewaitsuntilthechildrenareasleep.Thenhequietlygoesintotheirbedroomsandfillstheirstockingswithsmallpresents.WhentheywereveryyoungMr.Greensometimesworearedcoat.Buthedoesn’tdothatnow.Thechildrenarenolongeryoungandtheyknowwho"FatherChristmas"reallyis.Buttheystillputtheirstockingsattheendoftheirbeds. Whenthechildrenareolderthey.
如图△ABC中∠BAC=70°∠ABC=45°点O是△ABC的外接圆的圆心则∠AOB等于
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ELastyearShanghai-bornCharlesK.KaoandtwoNorthAmericanscientistsgotthe2009NobelPrize诺贝尔奖inPhysicstogether.TheirworkmadetheInternetcomeintoanewage.Kao77wasborninShanghaiin1933.Heisfamousforfindingouthowtotransmit传输lightsignals信号overlongwaysthroughglassfibers玻璃纤维asthinasahumanhair.HisworkmakestheInternetinformationtransmitfasteraroundtheworld.Kaowasvicechancellor副校长oftheChineseUniversityofHongKongfrom1987to1996.Hedoesn’tworkandlivesinHongKongnow.TheChinesepeoplewerepleasedtolearnthegoodnews.ThepeopleofHongKongandIsendourcongratulationstoKaoonreceivingtheprize...Kaoisalsoatruegentleman.WearegreatlyproudtohavesuchanexcellentpersoninHongKong.ZengYinquanoncesaid.WillardBoyleaCanadianAmericanandGeorgeSmithoftheUnitedStatesgottheotherhalfoftheprize.Howmanyscientistsgotthe2009NobelPrizeinPhysicstogether
DearAmy IhaveaproblemandI’mwritingaskyou1. foranadvice.Thisisasecretsoldon’ttellanybodyelse.2. MycousinandIusedtogettingalongverywelland3. weweregoodfriend.Wewereplanningtospend4. partofthewinterholidaytogetherbutnow5. Idon’tthinkIwanttoinviteherhome.6. RecentlyIhasdiscoveredthathe’sstartedtotell7. lies.WhenItoldhimthiswaswrongtotelllies8. buthejustlaughedatme.TheproblemisshouldI9. tellhisparentsorhisteacherorshouldIkeepquietly.10. 第6空应
Annalivedonthesideofavalley山谷.OnewintertherewasaverybigfloodandalotofhousesdownbelowAnna’shousewerewashedaway.Anna’shousewashighenoughtoescapethefloodsowhenthewaterhaddisappearedandtheotherhouseswerestandingtherewithnoroofsandwallsandallcoveredwithmudherhousewasstillquiteallright.ThatyearAnna’swasverylucky. HerhousewasquitesmallandtherewereonlytwosmallbedroomsherhusbandwasdeadwhenthechildrenwereveryyoungandshehadfourchildrenbutAnnatookinoneofthefamiliesthathadlosteverythinginthefloodandshesharedherhomewiththemuntilitwaspossibleforthemtorebuildtheirhouse. Anna’sfriendswereverypuzzled困惑whentheysawAnnadothis.TheycouldnotunderstandwhyAnnawantedtogiveherselfsomuchmoreworkandtroublewhenshehadalreadyquitealotofchildrentosupport.Lifewouldbeevenharderwhenanotherfamilyjoinedthem. "Well"Annaexplainedtoherfriends"attheendoftheFirstWorldWarawomaninthetownwhereIthenlivedinGermanyfoundherselfverypoorbecauseherhusbandhadbeenkilledinthewarandshehadalotofchildrenasIhavenow." "ThedaybeforeChristmasthiswomansaidtoherchildren’Wewon’thavemuchforChristmasthisyearsoIamgoingtogetonlyonegiftforallofusandIamsurewewillallbegladtohaveit.NowI’llgoandgetit.’Shecamebackwithalittlegirlwhowasevenpoorerthantheyandwhohadnoparents.’Hereisourgift’shesaidtoherchildren." "Thechildrenwereveryexcitedandhappytogetsuchagift.TheywelcomedthelittlegirlandshegrewupastheirsisterIwasjustthatChristmasgift./ WhywasAnnawillingtohelpthepoor
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BWastecanbeseeneverywhereintheschool.Somestudentsaskformorefoodthantheycaneatandothersoftenforgettoturnoffthelightswhentheyleavetheclassroom.Theysaytheycanaffordthesethings.ButIdon’tagreewiththem.Wastecanbringalotofproblems.AlthoughChinaisrichinsomeresources资源weareshortof缺乏othersforexamplefreshwater淡水.Itisreportedthatwewillhavenocoal煤oroiltousein100years.SoifwegoonwastingourresourceswhatcanweuseinthefutureandwherecanwemoveThinkaboutit.Ithinkweshouldsaynotothestudentswhowastethingseveryday.Everybodyshouldstopwastingassoonaspossible.Inoureverydaylifewecandomanythingstopreventwastefromhappeningforexampleturnoffthewatertaps水龙头whenwefinishwashingturnoffthelightswhenweleavetheclassroomtrynottoordermorefoodthanweneedandsoon.Littlebylittleeverythingwillhechanged.Wastecanbestoppedonedayifwedoourbest.Whichisthebesttitleofthispassage
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根据要求完成短文写作把答案写在答卷指定的位置上假如你是校长李枫看到以上三位同学的意见写一封公开信说明你对以上意见或建议的看法并陈述原因或提出改进措施不能照抄原文80个单词左右开头和结尾已经给出不计入总词数要求1说明立场接受或不接受意见或建议2.解释原因或提出改进措施3.语句通顺流畅DearstudentsSomestudentshavewrittentomeaboutourschoollifeorrules.NowI’mwritingtotellyouwhatIthinkaboutyourideas.ToZhangHongyingI’dliketosayIhopeeveryonehaveabetterlifeatschoolanddobetterinallyourlessons.YoursMr.Lee
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据统计2007年苏州工业园区实现地区生产总值836亿元人均GDP已经接近新加坡水平请你将836亿元用科学记数法表示成元或者万元
Annalivedonthesideofavalley山谷.OnewintertherewasaverybigfloodandalotofhousesdownbelowAnna’shousewerewashedaway.Anna’shousewashighenoughtoescapethefloodsowhenthewaterhaddisappearedandtheotherhouseswerestandingtherewithnoroofsandwallsandallcoveredwithmudherhousewasstillquiteallright.ThatyearAnna’swasverylucky. HerhousewasquitesmallandtherewereonlytwosmallbedroomsherhusbandwasdeadwhenthechildrenwereveryyoungandshehadfourchildrenbutAnnatookinoneofthefamiliesthathadlosteverythinginthefloodandshesharedherhomewiththemuntilitwaspossibleforthemtorebuildtheirhouse. Anna’sfriendswereverypuzzled困惑whentheysawAnnadothis.TheycouldnotunderstandwhyAnnawantedtogiveherselfsomuchmoreworkandtroublewhenshehadalreadyquitealotofchildrentosupport.Lifewouldbeevenharderwhenanotherfamilyjoinedthem. "Well"Annaexplainedtoherfriends"attheendoftheFirstWorldWarawomaninthetownwhereIthenlivedinGermanyfoundherselfverypoorbecauseherhusbandhadbeenkilledinthewarandshehadalotofchildrenasIhavenow." "ThedaybeforeChristmasthiswomansaidtoherchildren’Wewon’thavemuchforChristmasthisyearsoIamgoingtogetonlyonegiftforallofusandIamsurewewillallbegladtohaveit.NowI’llgoandgetit.’Shecamebackwithalittlegirlwhowasevenpoorerthantheyandwhohadnoparents.’Hereisourgift’shesaidtoherchildren." "Thechildrenwereveryexcitedandhappytogetsuchagift.TheywelcomedthelittlegirlandshegrewupastheirsisterIwasjustthatChristmasgift./ WheredidAnnalive
BWastecanbeseeneverywhereintheschool.Somestudentsaskformorefoodthantheycaneatandothersoftenforgettoturnoffthelightswhentheyleavetheclassroom.Theysaytheycanaffordthesethings.ButIdon’tagreewiththem.Wastecanbringalotofproblems.AlthoughChinaisrichinsomeresources资源weareshortof缺乏othersforexamplefreshwater淡水.Itisreportedthatwewillhavenocoal煤oroiltousein100years.SoifwegoonwastingourresourceswhatcanweuseinthefutureandwherecanwemoveThinkaboutit.Ithinkweshouldsaynotothestudentswhowastethingseveryday.Everybodyshouldstopwastingassoonaspossible.Inoureverydaylifewecandomanythingstopreventwastefromhappeningforexampleturnoffthewatertaps水龙头whenwefinishwashingturnoffthelightswhenweleavetheclassroomtrynottoordermorefoodthanweneedandsoon.Littlebylittleeverythingwillhechanged.Wastecanbestoppedonedayifwedoourbest.Whatmayhappenin100years
C OnChristmasEve—thenightbeforeChristmasDay—childrenalloverBritainputastockingattheendoftheirbedsbeforetheygotosleep.TheirparentsusuallytellthemthatFatherChristmaswillcomeduringthenight. FatherChristmasisverykind-hearted.Hegetstothetopofeachhouseandclimbsdownthechimneyintothefireplace.HefillseachofthestockingswithChristmaspresents. OfcourseFatherChristmasisn’treal.InJimandKate’shouse"FatherChristmas"isreallyMr.Green.Mr.Greendoesn’tclimbdownthechimney.Hewaitsuntilthechildrenareasleep.Thenhequietlygoesintotheirbedroomsandfillstheirstockingswithsmallpresents.WhentheywereveryyoungMr.Greensometimesworearedcoat.Buthedoesn’tdothatnow.Thechildrenarenolongeryoungandtheyknowwho"FatherChristmas"reallyis.Buttheystillputtheirstockingsattheendoftheirbeds. FatherChristmasoftenputspresents.
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