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平地上有100棵树，高度从最低3米到最高l0米不等，且任意两棵树之间的距离都不超过它们高度差的50倍。现在要用篱笆将它们全部围起来，在不知道树木位置的情况下，至少要准备多少米的篱笆才能确保完成任务（）...
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植树节某班20名同学在一段直线公路一侧植树每人植一棵相邻两棵树相距l0米开始时需将树苗集中放置在某一
①或⑩
⑨或⑩
⑨或①
⑩或⑩
如图所示平地上一棵树高为5米两次观察地面上的影子第一次是当阳光与地面成45°时第二次是阳光与地面成
如图所示平地上一棵树高为5米两次观察地面上的影子第一次是当阳光与地面成45°时第二次是阳光与地面成
小明为了估算学校旗杆的高度旗杆底端在水平地上把一面小镜子平放在离旗杆底端12米的水平地上并沿旗杆底端
高4米的旗杆在水平地面的影长为10米此时测得附近一棵小树的影长为22.5米则这棵树的高度为_____
如图坡面CD的坡比为坡顶的平地BC上有一棵小树AB当太阳光线与水平线夹角成60°时测得小树的在坡顶平
某小区两栋楼之间间距为375米现在要在两栋楼之间种74棵树请问第5棵树到第26棵树之间的距离是多少米
90
95
100
105
如图坡面CD的坡比为坡顶的平地BC上有一棵小树AB当太阳光线与水平线夹角成60°时测得小树的在坡顶平
在同一地平面上有两棵树一棵高6米另一棵高2米两树相距5米一只小鸟从一棵树的树梢飞到另一棵树的树梢则至
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把下面的六个图形分为两类使每一类图形都有各自的共同特征或规律分类正确的一项是
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把下面的六个图形分为两类使每一类图形都有各自的共同特征或规律分类正确的一项是
Questions107-111refertothefollowingjobadvertisement． Accordingtothepostingswhatskillshouldapplicantsatbothcompanieshave
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根据下面内容回答31-35题 2012年年末全国公路总里程达423．76万公里比上年末增加l3．11万公里公路密度为44．14公里／百平方公里比上年末提高1．37公里百平方公里按行政等级划分国道17．34万公里省道31．21万公里县道53．95万公里乡道l07．67万公里专用公路7．37万公里村道206．22万公里比上年末分别增加0．40万公里080万公里0．59万公里1.07万公里0．47万公里和9．78万公里国道中国家高速公路6．80万公里普通国道l0．54万公里按技术等级划分等级公路为全国四级以上公路含高速等级公路里程360．97万公里比上年末增加l5．60万公里等级公路占公路总里程的85．2％比上年末提高l．1个百分点其中与上年相比二级及以上公路里程增加2．83万公里 2012年年末国道省道及县道占全国公路总里程的比重约为
Questions99-101refertothefollowingletter. January15 EstherChen 555QueensRoad LeedsEngland DearDr.Chen Thankyouforyourletter.Weunderstandthatyouhavedecidednotto____①______yoursubscrip-tiontointernationalmedicine.Wearetrulysorrytoloseyouasasubscriber.Asyouknowmostotherjournalsinthefieldfocusonspecializedresearchtopicswithlittle____②_______today-to-daymedicalcare.Ourmagazineisoneofthefewtofeaturenewadvancesinbothmedicalresearchandclinicatpractice. Wewouldliketoofferyoua40percentdiscountononeyear'ssubscription.Plusifyoucon-tactoursubscriptionofficebeforeJanuary30wewillsendyouanyissuesyouhavemissedfreeofcharge.Pleasementionmynameinorderforyourdiscounttobeapplied______③_____Wehopetohearfromyou. Sincerely RobertGoldberg VicePresidentSubscriptionsDepartment ①
中央银行在市场中向商业银行大量卖出证券从而减少商业银行超额存款准备金引起货币供应量减少市场利率上升中央银行动用的货币政策工具是
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事实上葡萄糖燃料电池的理念并不是早在20世纪70年代科学家就提出能以这种电池为心脏起搏器提供动力但这______最终因为葡萄糖燃料电池所使用的酶不能长久发挥作用以及锂离子电池能在单位面积内提供更强劲的能量而______填入画横线部分最恰当的一项是
如图有一个正方体水箱在某一个侧面相同高度的地方有三个大小相同的出水孔用一个进水管给空水箱灌水若三个出水孔全关闭则需要用1小时将水箱灌满若打开一个出水孔则需要用1小时5分钟将水箱灌满若打开两个出水孔则需要用72分钟将水箱灌满若三个出水孔全打开则需要用分钟才能将水箱灌满
Questions102-106refertothefollowingpassage. Risingwages--togetherwithcurrencyfluctuationsandhighfuelcosts--areeatingawaytheonce-formidableChinapriceadvantagepromptingthousandsoffactoryownerstofleethePearlRiverDelta.MuchhasbeenwrittenaboutthemorethandoublingofwagesattheShenzhenfactoryofFoxconntheworld'slargestelectronicscontractmanufacturerwhichproducesAppleiPhonesandiPadsandemploys920000peopleinChinaalone.Onecantalkaboutaworldpre-andpost-FoxconnsaysVictorFungchairmanofLi&Fungtheworld'sbiggestsourcingcompanyandasupplierofWal-Mart.Foxconnisasimportantasthat. Foxconn'swageincreasesareonlythemostdramatic.OuranalysissuggeststhatsinceFebruaryminimumwageshaveclimbedmorethan20percentin20Chineseregionsandupto30percentinsomeincludingSichuan.AtaGuangdongProvincefactorysupplyingHondawageshaverisenanastonishing47percent.Allthisisbadnewsforcompaniesoperatingintheworld'smanufacturinghubandchiefexecutivesshouldassumethatdouble-digitannualrises--ifnotonthescalewitnessedthisyear--areheretostay. Lookedatanotherwayhoweverwageinflationprovidescompanieswithaonce-in-a-generationopportunitytorethinkradicallythewaytheyapproachglobalproduction--andtheyshoulddososoonerratherthanlater. Whytheurgency?AfterallwagehikesinChinaarenothingnew.Since1990theyhaverisenbyanaverageof13percentayearinU.S.dollartermsand19percentannuallyinthepastfiveyears. Therearetwobigreasonsandthesituationisdifferentnow.Thefirsthastodowithproductivity.Overthepast20yearsproductivityincreaseshavebroadlymatchedwageincreasenegatingtheirimpact.Thepayrisescamefromaverylowbasesowhileaveragewagesgrew19percentayearfrom2005to2010thisamountedtoonly~260amonthperemployeeasumthatcouldbeoffsetbymoreefficientproductionorswitchingtocheapersourceszfpartsandmaterials. Iflaborcostscontinuehowevertoincreaseat19percentayearforanotherfiveyearsmonthlywageswouldgrew~623permonthaccordingtoBCGestimates.Suchanincreasewouldripplethroughtheeconomyintheformofhigherpricesforcomponentsbusinessservicescargo-handlingandofficestaff. Thesecondreasonrelatestosocietalchange.Untilnowithasbeeneasytolureaseeminglyunlimitednumberofyounglow-wageworkerstotherichercoastalregionsandhousethemcheaplyindormitoriesuntiltheysavedenoughtoreturnhometotheirfamiliesintheinteriorprovinces.Inthefuturethoughyoungworkerswillbehardertorecruit.Thisispartlybecausetherewillbefew-erofthem:Largelybecauseofthecountry'sone-childpolicythenumberofChineseaged15to29willstartdecliningin2011.MoreoverwithlivingstandardsrisingacrossChinafeweroftoday'sruralyouthwillwanttogotocoastalregionstotoilfor60hoursaweekonanassemblylineandliveinacrampeddormitory. SowhatcanCEOsdointhisfast-changingenvironment?Aninstinctivereactionistosearchforcheaperlaborelsewhere.Butthisisshort-sightedandwouldprovide--atbest--ashort-termfix.AnotheroptionistostayinChinaandtrytosqueezeoutgreaterproductivitygains. InParagraph5theauthordiscussesthat
星云是由星际空间的气体和尘埃结合成的云雾状天体星云里的物质密度是很低的若拿地球上的标准来衡量的话有些地方是真空的可是星云的体积十分庞大常常方圆达几十光年星云和恒星有着血缘关系恒星抛出的气体将成为星云的部分星云物质在引力作用下压缩成为恒星在一定条件下星云和恒星是能够互相转化的下列说法与这段文字相符的是
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在横线处填入短语顺序最恰当的一项是保护动物已不是人们陌生的话题人类的发展也早已达到可以把其他动物玩弄于掌中并主宰它们的命运的程度但当________________________的时候人类真正考虑过动物和人在生命意义上的平等吗①老虎服服帖帖在舞台上表演②用于实验的动物为科学献身③兔子小鸡成为孩子们的玩物④耕作的动物在田间地头劳作
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触底反弹行情回暖V形复苏价格指数坐庄2010年当人们谈论艺术品拍卖市场时从股市舶来的这些名词被熟练地援引使用于口头和书面其出现频率之高让人错觉正在谈论的是股票或房产并非书画古董这段文字的关键词是
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