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三棱锥的三条侧棱两两垂直，其长分别是1、、，则此三棱锥的外接球的表面积是 ．
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高一上学期数学《2017-2018学年甘肃省临夏州临夏中学高一（上）期末数学试卷》真题及答案
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已知三棱锥S—ABC的三条侧棱两两垂直且SA=2SB=SC=4则该三棱锥的外接球的半径为
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已知三棱锥的三条侧棱两两垂直且则该三棱锥的外接球的半径为
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已知正三棱锥的侧棱长为1底面正三角形的边长为.现从该正三棱锥的六条棱中随机选取两条棱则这两条棱互相垂
三棱锥P.﹣ABC三条侧棱两两垂直三个侧面面积分别为则该三棱锥的外接球表面积为
4π
6π
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若三棱锥的三条侧棱两两垂直且侧棱长均为则其外接球的表面积是.
一个三棱锥S.－ABC的三条侧棱S
S
SC两两互相垂直，且长度分别为1，
，3，已知该三棱锥的四个顶点都在同一个球面上，则这个球的表面积为( ) A.16πB.32π
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正三棱锥P.－ABC中三条侧棱两两垂直且侧棱长为则P.点到面ABC的距离是
三棱锥P-ABC的侧棱P
P
PC两两垂直，侧面面积分别是6，4，3，则三棱锥的体积是 （ ） A. 4 B. 6
8
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若三棱锥的三条侧棱两两垂直且其长度分别为则此三棱锥的外接球的表面积为
三棱锥的三条侧棱两两垂直其长分别是1则此三棱锥的外接球的表面积是．
已知三棱锥P﹣ABC的三条侧棱PAPBPC两两互相垂直且PA＝PB＝PC＝a则该三棱锥的外接球的体
若三棱锥P﹣ABC的三条侧棱PAPBPC两两互相垂直且长都相等其外接球半径为2则三棱锥的表面积为．
三棱锥的三条侧棱两两互相垂直且则两点在三棱锥的外接球上的球面距离为______
三棱锥的三条侧棱两两垂直则顶点在底面的射影是底面三角形的
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若三棱锥的三条侧棱两两垂直且其长度分别为则此三棱锥的外接球的表面积为
三棱锥的三条侧棱两两垂直其长分别是1则此三棱锥的外接球的表面积是．
已知正三棱锥的侧棱长为1底面正三角形的边长为.现从该正三棱锥的六条棱中随机选取两条棱则这两条棱互相垂
将侧棱相互垂直的三棱锥称为直角三棱锥三棱锥的侧面和底面分别叫为直角三棱锥的直角面和斜面过三棱锥顶点及
已知三棱锥P﹣ABC的三条侧棱两两互相垂直且PA＝1PB＝1则此三棱锥外接球的体积为．
三棱锥的三条侧棱两两垂直其长分别为则该三棱锥的外接球的表面积
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Benisusedtoupearly.get
Whatisrudeandwhatispoliteisdifferentindifferentcountries.SomethingsthatmanyChinesepeopledocanbeconsideredrudeornot1inWesterncountries.Hereissome2aboutwhatNOTtosayordo.Let's3.Inbusinesssettingsoneshouldnever4aforeigneracigarette.Smokingkills.Don't5anyone.ThatisveryRUDEanditsmellsverybad.Smokerssmell.PLEASEDON'TSMOKE!6getangryatsomeoneforgoingDutch各自付账and7thebillwhenyoueatout.IntheWestitshowsequal平等的8.TrygoingDutchItischeaperanditshowsequality!WheneatingdinnerinNorwayandtheUnitedStatesitispoliteto9everythingonyourplateto10thatyouenjoyedthefood11insomecountriesitispolitetoleavesomeofthefoodonyourplate.Don'tusebad12atwork.Eventhoughsomefamouspeople13thembadwordsareasignofabadeducation.Badwordsshouldbeused14ornotatall.Ifyouhavetospit吐痰clearyournoseorcleanyourearsdoitinthebathroomwherenoonecan15you.Don'tbeaRUDEpersonatyourofficeorinpublic. 1.A.polite B.important C.particular D.pleased2.A.manners B.symbols C.news D.advice 3.A.havearest B.havealook C.haveatry D.haveatalk 4.A.pick B.sell C.offer D.point 5.A.seek B.kill C.stop D.trouble 6.A.Always B.Never C.Sometimes D.Often 7.A.pay B.keep C.share D.take 8.A.aim B.respect C.payment D.emotion 9.A.leaveoff B.takeaway C.putoffD.eatup 10.A.show B.know C.say D.lead11.A.and B.but C.so D.because 12.A.words B.sentences C.passages D.texts 13.A.use B.hate C.make D.discuss 14.A.asmuchaspossible B.aslittleaspossible C.asoftenaspossible D.assoonaspossible 15.A.stop B.prevent C.see D.hurt
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Thereareaboutfifteenhundredlanguagesintheworld.But1.afewofthemareveryimportant.Englishisoneofthese.ManymanypeopleuseitnotonlyinEnglandandtheUSAbutinotherpartsoftheworld.About200000000peoplespeakitastheirownlanguage.Itis difficulttosayhowmanypeoplearelearningitasa2.language.Manymillionsaretryingtodoso.IsiteasyordifficulttolearnEnglish?Differentpeoplemayhavedifferent3..Haveyouever4.adsofthiskindinthenewspapersormagazines?LearnEnglishinsixweeksoryour5.back...Easyandfunny!Ourrecordsandtapes6.youmasteryourEnglishinamonth.7.thefirstdayyourpronunciationwillbeexcellent.Justsend...Ofcourseitneverhappenedquitelikethis.Theonlylanguagethatseemseasytolearnisthemothertongue.Weshould8.thatwealllearnedourownlanguagewellwhenwewere9..IfwecouldlearnEnglishinthesamewayitwouldnotseemsodifficult.10.whatasmallchilddoes.Helistenstowhatpeoplesay.Hetrieswhathehears.Whenheisusingthelanguagetalkinginit11.initallthetime.Justimaginehowmuch12.thatgets!Soitis13.tosaythatlearningEnglishiseasybecauseagoodcommandofEnglish14.onalotofpractice.Andpracticeneedsgreateffortand15.muchtime.Goodteachersrecordstapesbooksand.dictionarieswillhelp.Buttheycannotdothestudent'sworkforhim.1.A.not B.quite C.only D.very 2.A.native B.foreign C.useful D.mother3.A.questions B.problems C.ideas D.answers 4.A.found B.watchedC.noticed D.known 5.A.knowledgeB.time C.money D.English6.A.make B.help C.let D.allow 7.A.From B.On C.Since D.After 8.A.know B.rememberC.understand D.think 9.A.students B.children C.babies D.grown-ups 10.A.Imagine B.Mind C.Do D.Thinkof 11.A.using B.thinking C.trying D.practicing 12.A.time B.money C.language D.practice 13.A.hard B.easy C.funny D.silly 14.A.depends B.tries C.has D.takes 15.A.uses B.takes C.gets D.costs
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临武鸭是中国八大名鸭之一是中国地理标志产品它的羽毛颜色有白色麻灰土黄和棕褐色由两对相互独立的等位基因控制基因Aa在常染色体上基因Bb在性染色体的非同源区上基因A控制合成酶A形成麻灰色羽毛基因B控制合成酶B形成土黄色羽毛无AB基因时羽毛呈白色AB同时存在时羽毛呈棕褐色．图1示羽色遗传机理图2为临武鸭一个家系的羽毛颜色遗传图谱．请回答下列问题12号为一只棕褐色个体其基因型为3号与2号交配时生出7号时产生的卵细胞基因型为请在下侧方框中画出3号产生此卵细胞过程中减数第一次分裂后期的图象只需画出相关基因所在的染色体并在染色体的对应位置标注相关基因．．2此家系中8号为白色羽毛的概率为．3现有一只麻灰雄鸭欲在一个繁殖季节内鉴定其基因型请完成以下实验设计设计思路选择与之杂交预期结果及分析①若子代该麻灰雄鸭为杂合子②若子代该麻灰雄鸭很可能为纯合子．
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木聚糖酶系可以将半纤维素一种多糖转化为单细胞蛋白和其他有用物质．有些嗜热菌能产生耐热木聚糖酶在食品工业上具有较高的潜在应用价值．现欲从温泉中分离能分解半纤维素的嗜热菌并从中筛选木聚糖酶高产菌株获得耐热木聚糖酶．回答下列问题1实验中接种环使用前后都在酒精灯上灼烧其目的是．2取适量体积的样品涂布在富含且其为唯一碳源的固体培养基上置于恒温培养箱中培养菌落长出后挑取单个菌落并进行一系列操作然后在培养基上用法接种培养进行菌株的．最后将得到的菌株接种到填固体或液体培养基中富集．3将富集后的菌株接种于固体培养基上待菌落长出后用0.1%的染色1h再用1mol/LNaCl脱色．菌落周围会出现筛选的菌落即为木聚糖酶高产菌株．
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为了研究特殊温度和昼夜温差对天竺葵生长的影响状况已知该地天竺葵生长的适宜温度条件是20〜30℃科研人员分别在20℃和40℃培养条件下其他条件适宜测得天竺葵的部分数据如图A图B是昼夜温差对天竺葵生长的影响其中曲线a为日温为26℃曲线b为昼夜恒温．请据图回答1图A中叶肉细胞间隙C02主要来源于．2某兴趣小组测定了20〜40℃范围内该植物的净光合速率发现30℃时净光合速率最大则30℃填是不是或不一定是光合作用的最适温度原因是．3若将培养温度由20℃快速提升至40℃时据图分析该植物叶肉细胞间隙C02浓度明显填上升或下降这一变化的主要原因是．4从图B曲线a中可以看出茎在夜间温度为20℃时的生长速率比在10℃时要快原因是．5图B中ab两曲线的夜间温度都为5℃时曲线a比b反映出的生长速率快原因是．
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OurlocalCommunityYouthClubisaverypopularorganizationwithyoungpeopleinmytown.IhavebeenamemberforfouryearsnowandI'vetakenpartinalotofinterestingprojects.Theseincludefunactivitiessuchasholidaycampsanddiscos.Wehaveevenmadeavideo.Butitisn'talljustenjoyment.Wehavealsostarteddoingsocialworktohelppeopleinourneighborhood.Wehaveorganizedactivitiesforsmallchildrenduringtheholidays.Wehavealsoformedaspecialsupportgrouptohelpyoungpeoplestopsmoking.Weareparticularlyproudofthemostrecentgroupwehavecreated.Itorganizesregularvisitstothelocalhomefortheelderly.Thisideacamefromaschoolvisittoahomefortheelderly.Myclassspentanafternoonatthehomeandeveryonefoundthevisitveryrewarding有价值的.Theoldpeopleatthehomewereexcitedbyourvisit.Theywereverytalkative健谈的andtheytoldustheirpersonalstories.Duringourvisitthehomewasfullofthesoundoflaughter.Wesangsongsandplayedgameswiththeoldpeopleandhadteatogether.Butwerealizethatlifewasn’talwayseasy.Someofthemwereinpoorhealthandwereveryunhappy.Theycouldn'tgooutsideandthevisitsbychildrenbroughtsomesunshineintotheirlives.Manyyoungpeoplelikemehaveverylittlecontactwithelderlypeople.Asaresultwehavealotofwrongideasaboutthem.Wehavelittleornoideaofthekindoflivestheyleadinthehomes.AfterthisvisitmyfriendsandIdecidedweshoulddosomethingtohelpimprovethequalityoftheirlives.Sincethecreationofourvisitinggroupovertwentyvolunteershavejoinedus.Uptonowwehaveorganizedthreeeveningpartiesandaconcert.ButIthinktheindividual单独的visitsarethemostimportant.Clubmembersregularlyvisitoldpeopleandeveryonefindstheexperiencerichandrewarding.根据短文内容回答问题 1.IsthewriteramemberoftheCommunityYouthClub?2.Howdidtheoldpeoplefeelbythechildren'svisit? 3.Whydoyoungpeoplehavewrongideasabouttheelderly? 4.Whatdidthewriterandhisfriendsdecidetodoafterthevisittothehomefortheelderly? 5.Putthesentence“Theycouldn'tgooutsideandthevisitsbychildrenbroughtsomesunshineintotheirlives.”intoChinese.
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，3，已知该三棱锥的四个顶点都在同一个球面上，则这个球的表面积为( ) A.16πB.32π 36π 64π
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