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某校兴趣小组想测量一座大楼AB的高度．如图，大楼前有一段斜坡BC，已知BC的长为24米，它的坡度i=1：．在离C点80米的D处，用测角仪测得大楼顶端A的仰角为37°，测角仪DE的高为1.5米，求大楼...
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泖塔是青浦沈巷泖河中小岛上的一座古塔建于唐乾符年间874﹣879年是五级四面的方形塔砖．某校数学兴
如图是成都市某在建的大楼准备上市销售大楼前有一座装有__线的铁塔BC经过市民想知道__线的电辐射对居
如图某校数学兴趣小组的同学欲测量一座垂直于地面的古塔BD的高度他们先在A.处测得古塔顶端点D.的仰角
某校兴趣小组想测量一座大楼AB的高度.如图大楼前有一段斜坡BC已知BC的长为12米它的坡度i=1.在
某校数学兴趣小组要测量西山植物园蒲宁之珠的高度.如图他们在点A.处测得蒲宁之珠最高点C.的仰角为45
如图某校数学兴趣小组的同学欲测量一座垂直于地面的古塔BD的高度他们先在A处测得古塔顶端点D的仰角为
如图所示某办公大楼正前方有一根高度是15米的旗杆ED从办公大楼顶端
测得旗杆顶端E.的俯角α是45°，旗杆低端D.到大楼前梯砍底边的距离DC是20米，梯坎坡长BC是12米，梯坎坡度i=1:
，则大楼AB的高度约为（精确到0.1米，参考数据：
） （） A.30.6米
32.1 米
37.9米
39.4米
小玲用下面的方法来测量教学大楼AB的高度∶如图在水平地面上放一面平面镜镜子与教学大楼的距离EA=21
如图某校数学兴趣小组的同学欲测量一座垂直于地面的古塔BD的高度他们先在A.处测得古塔顶端点D.的仰角
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测得旗杆顶端E.的俯角α是45°，旗杆低端D.到大楼前梯砍底边的距离DC是20米，梯坎坡长BC是12米，梯坎坡度i=1:
，则大楼AB的高度约为（精确到0.1米，参考数据：
） （） A.30.6米
32.1 米
37.9米
39.4米
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如图某校数学兴趣小组的同学欲测量一座垂直于地面的古塔BD的高度他们先在A.处测得古塔顶端点D.的仰角
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下列关于生物膜结构和功能的叙述正确的是
柑橘果实色香味兼优既可鲜食也可加工成果汁果酒果醋等各种食品．柑橘类的果皮中富含柑橘精油无色透明具有诱人的橘香味是天然香料精油中的一大类在食品以及化妆品行业具有广泛的应用价值．请回答下列相关问题． 1柑橘精油提取 ①为了避免原料发生焦糊有效成分水解等问题橘皮精油的提取一般采用法． ②提取橘皮精油首先要用浸泡原料这是因为石灰水能够破坏细胞结构分解果胶防止橘皮压榨时滑脱提高． ③初步得到橘皮精油后还要分别加入0.25%的小苏打和5%的硫酸钠并调节pH至7～8这样处理的目的是． 2柑橘果酒和果醋制作 ①发酵罐1和发酵罐2中的微生物在结构上的主要区别是前者． ②发酵罐1过程完成后可以用检测发酵产物中是否有酒精产生．若要进一步检测所得果酒中酵母菌的密度可采用法． ③某同学尝试用罐头瓶制作果酒在培养过程中每隔12h左右将瓶盖拧松一次此后再拧紧这样做的主要目的．
8分TheChineseinventedpaperin105A.D.Theymixedthebarkofatreeandrags破布withwaterputascreenintothemixtureandliftedoutathinpieceofwetpaper.Theydriedthepaperinthesun. TheChinesekepttheirsecretofhowtomakepaperuntilawarwithMuslimsintheninthcentury.TheartofpapermakingsoonspreadthroughouttheMuslimworld. TheMayanIndiansinCentralAmericaandPacificIslandersalsodiscoveredhowtomakepaperbuttheirknowledgeneverspreadtotherestoftheworld. Forcenturiesallpaperwasmadebyhand.Ragswerethemainmaterial.ThenaFrenchscientistdiscoveredthatpeoplecouldmakepaperfromwoodtoo.Finallyintheeighteenthcentury.aFrenchmaninventedamachinetomakepaperfromwood. 1.Whodiscoveredhowtomakepaper? A.TheChinese. B.ThePacificIslanders. C.TheMayanIndians. D.Alloftheabove. 2.WhendidtheChineseinventpaperaccordingtothepassage? A.About1800yearsago. B.About1900yearsago. C.About2000yearsago. D.About2100yearsago. 3.HowwaspapermakingintroducedintotherestoftheworldfromChina? A.Throughwars. B.ThroughtheMuslims. C.ThroughtheMayanIndians. D.ThroughthePacificIslanders. 4.Whichofthefollowingisthebesttitleforthispassage? A.TheInventionofPaper. B.TheHistoryofPapermaking. C.DifferentWaysofMakingPaper. D.TheInventionofaPapermakingMachine.
1分Juliaiseasytorecognizeasshe'stheonlyoneofthegirlswhoaringroundherwrist. A.wear B.wears C.hasworn D.haveworn
1分Ican'tstandwithLucy.Shedoesnothingbutallday. A.workingtalk B.worktalk C.workingtalking D.worktotalk
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，则大楼AB的高度约为（精确到0.1米，参考数据：
） （） A.30.6米 32.1 米 37.9米 39.4米
，则大楼AB的高度约为（精确到0.1米，参考数据：
） （） A.30.6米 32.1 米 37.9米 39.4米
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