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某玻璃材料制成的光学元件截面如图所示，左边是半径为R的半圆，右边是直角三角形CDE，∠DCE＝60°．A点发出一细光束从B点射入元件后与AO平行（O为半圆的圆心，CD为直径，AO与CD垂直）．已知玻...
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高三下学期物理《》真题及答案
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某玻璃材料制成的光学元件截面如图所示左边是半径为R的半圆右边是直角三角形CDE∠DCE＝60°．A点
半径为R的半圆柱形玻璃横截面如图所示O为圆心已知玻璃的折射率为当光由玻璃射向空气时发生全反射的临界角
两束平行的细激光束垂直于半圆柱玻璃的平面射到半圆柱玻璃上如图所示已知其中一条光线沿直线穿过玻璃它的入
某玻璃材料制成的光学元件截面如图所示左边是半径为R的半圆右边是直角三角形CDE∠DCE＝60°．A
一半径为R.的半圆形玻璃砖横截面如图所示已知玻璃的全反射临界角rr
一半径为R.的半圆形玻璃砖横截面如图所示已知玻璃的全反射临界角rr
某玻璃材料制成的光学元件截面如图所示左边是半径为R的半圆右边是直角三角形CDE∠DCE＝60°．A
某玻璃材料制成的光学元件截面如图所示左边是半径为R的半圆右边是直角三角形CDE∠DCE＝60°．A
某玻璃材料制成的光学元件截面如图所示左边是半径为R的半圆右边是直角三角形CDE∠DCE＝60°．A点
两束平行的细激光束垂直于半圆柱玻璃的平面射到半圆柱玻璃上如图所示.已知其中一条光线沿直线穿过玻璃它的
两束平行的细激光束垂直于半圆柱玻璃的平面射到半圆柱玻璃上如图所示已知其中一条光线沿直线穿过玻璃它的入
两束平行的细激光束垂直于半圆柱玻璃的平面射到半圆柱玻璃上如图所示.已知其中一条光线沿直线穿过玻璃它的
某玻璃材料制成的光学元件截面如图所示左边是半径为R的半圆右边是直角三角形CDE∠DCE＝60°．A
半径为R的玻璃半圆柱体横截面如图所示圆心为O两条平行单色红光沿截面射向圆柱面方向与底面垂直光线1的入
如图甲所示是由透明材料制成的半圆柱体一束细光束由真空沿着径向与AB成θ角射入后对射出的折射光线的强度
2018年·葫芦岛二模某玻璃材料制成的光学元件截面如图所示左边是半径为R的半圆右边是直角三角形CDE
2018年·厦门一模某玻璃材料制成的光学元件截面如图所示左边是半径为R的半圆右边是直角三角形CDE
一半径为R.的半圆形玻璃砖横截面如图所示O.为圆心一束平行光线照射到玻璃砖MO′面上中心光线a沿半径
半径为R.的半圆柱形玻璃砖的横截面如图所示O.为圆心光线I.沿半径方向从a点射入玻璃砖后恰好在O.点
半径为R.的半圆柱形玻璃横截面如图所示O.为圆心已知玻璃的折射率为当光由玻璃射向空气时发生全反射的临
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在一静止点电荷的电场中任一点的电势φ与该点到点电荷的距离r的关系如图所示．电场中四个点abc和d的电场强度大小分别EaEbEc和Ed点a到点电荷的距离ra与点a的电势φa已在图中用坐标raφa标出其余类推．现将一带正电的试探电荷由a点依次经bc点移动到d点在相邻两点间移动的过程中电场力所做的功分别为WabWbc和Wcd．下列选项正确的是
扫描隧道显微镜STM可用来探测样品表面原子尺寸上的形貌为了有效隔离外界震动对STM的扰动在圆底盘周边沿其径向对称地安装若干对紫铜薄板并施加磁场来快速衰减其微小震动如图所示无扰动时按下列四种方案对紫铜薄板施加恒磁场出现扰动后对于紫铜薄板上下及其左右震动的衰减最有效的方案是
如图a在xy平面内有两个沿z方向做简谐振动的点波源S104和S20﹣2．两波源的振动图线分别如图b和图c所示．两列波的波速均为1.00m/s．两列波从波源传播到点A8﹣2的路程差为m两列波引起的点B41处质点的振动相互填“加强”或“减弱”点C00.5处质点的振动相互填“加强”或“减弱”．
下列变化属于化学变化的是
已知变量x与y呈相关关系且由观测数据得到的样本数据散点图如图所示则由该观测数据算得的回归方程可能是
30分Searswasdiagnosed诊断withstageIVpancreaticcancer四期胰腺癌fivemonthsagoandonly50percentofpeoplewiththistypeof41livemorethanfourmonths.Andthechanceofsurvivallessens42timegoeson. Aftertwoyears431percentofpeoplediagnosedwiththiscancerlive.Heistakingchemotherapytreatment化疗tomakehislife44.Despiteeverythingheis45﹣﹣thethoughtofknowinghisdaysarenumberedandthetreatmentmighttakeonhim﹣﹣Searsstillchoosestodotheonethingheloves46. Searsisawonderfulpersonforustomodelourlivesafter.Hisdesiretopursuehispassion激情andhisattempttocontinueguidingstudentsare47weshouldhave.He48hismottotolivelifetothefullestwithhisstudents.Theycan49extracreditinhisclassforachievingadreamortrying50new.But51youdon'ttakeSears'classyoushouldconsiderthemottohelivesby. WeallshouldtakeSears'mottoandputitinto52.Manyofustalkaboutmakinga53ordoingsomethingwelovebutit'softenintermsofsomeday.Whynot54thatsomedayintosomethingyoucando55?Itcanbesomething56youwanttodosuchasgoingskydivingortravelingtoaforeigncountry. Whateveritisyouwanttododon't57anymore.Wedon'tknowhowmanydayswehavelefttolive.Itcouldbe80years58itcouldbeuntiltomorrow.Eitherwayweshouldtakea59fromaprofessorwhoknowswhathewantsinlifeandislivingtopursuethatpassion.Livelifetothefullestandtreateachdaylikeitcouldbeyour60. 41.A.trouble B.problem C.disease D.disaster 42.A.as B.with C.since D.for 43.A.yet B.still C.just D.thus 44.A.stronger B.weaker C.shorter D.longer 45.A.goingthrough B.gettingthrough C.gettingover D.goingover 46.A.living B.teaching C.reading D.dreaming 47.A.abilities B.activities C.identities D.qualities 48.A.shares B.teaches C.tells D.instructs 49.A.reward B.receive C.record D.recover 50.A.something B.anything C.everything D.nothing 51.A.whatif B.asif C.evenif D.onlyif 52.A.consideration B.effect C.reality D.practice 53.A.difference B.wonder C.magic D.solution 54.A.take B.turn C.put D.get 55.A.inthefuture B.inthepast C.atpresent D.attimes 56.A.helpful B.useful C.personal D.educational 57.A.imagine B.resist C.insist D.delay 58.A.or B.and C.but D.so 59.A.look B.lesson C.turn D.change 60.A.first B.last C.worst D.best
在直角坐标系xOy中曲线C1的参数方程为t为参数以坐标原点为极点x轴正半轴为极轴建立极坐标系．曲线C2的极坐标方程为． 1求曲线C1的普通方程曲线C2的参数方程 2若PQ分别为曲线C1C2上的动点求|PQ|的最小值并求|PQ|取得最小值时Q点的直角坐标．
已知集合A＝{xy|x2+y2＝1}B＝{xy|y＝x}则A∩B中元素的个数为
观察下列等式 1＝1 2+3+4＝9 3+4+5+6+7＝25 4+5+6+7+8+9+10＝49 … 照此规律第n个等式为．
已知i为虚数单位复数则|z|＝．
已知函数fx＝对于任意的x1≠x2都有x1﹣x2[fx2﹣fx1]＞0成立则实数a的取值范围是
已知一次函数y1=kx+mk≠0和二次函数y2=ax2+bx+ca≠0部分自变量与对应的函数值如下表 当y2＞y1时自变量x的取值范围是
已知奇函数fx是定义在﹣22上的减函数若fm﹣1+f2m﹣1＞0求实数m的取值范围．
计算下列各式 1+2﹣2•﹣0.010.5． 22lg5+lg8+lg5•lg20+lg22．
某探究小组为了研究小车在桌面上的直线运动用自制“滴水计时器”计量时间．实验前将该计时器固定在小车旁如图a所示．实验时保持桌面水平用手轻推一下小车．在小车运动过程中滴水计时器等时间间隔地滴下小水滴图b记录了桌面上连续6个水滴的位置．已知滴水计时器每30s内共滴下46个小水滴 1由图b可知小车在桌面上是填“从右向左”或“从左向右”运动的． 2该小组同学根据图b的数据判断出小车做匀变速运动．小车运动到图b中A点位置时的速度大小为m/s加速度大小为m/s2．结果均保留2位有效数字
下列实验操作中不正确的是
抛物线的部分图象如图所示则当y＜0时x的取值范围是
将质量为1.00kg的模型火箭点火升空50g燃烧的燃气以大小为600m/s的速度从火箭喷口在很短时间内喷出．在燃气喷出后的瞬间火箭的动量大小为喷出过程中重力和空气阻力可忽略
如图空间某区域存在匀强电场和匀强磁场电场方向竖直向上与纸面平行磁场方向垂直于纸面向里．三个带正电的微粒abc电荷量相等质量分别为mambmc．已知在该区域内a在纸面内做匀速圆周运动b在纸面内向右做匀速直线运动c在纸面内向左做匀速直线运动．下列选项正确的是
8分China'sonlineretailers零售商arebusypreparingforwhathasbecomethecountry'sannualonlineshoppingfestivalonNovember11th. November11isadatemadeupoffouronesanddoubleelevenhasalwaysbeenconsideredaspecialdayforsinglemenandwomeninChina.FiveyearsagotheInternetretailerAlibababeganpromotingitasashoppingfestivalandithasnowturnedtobethecountry'sbusiestdayforonlineretailersandmillionsofshoppinglovers. JD.comistryingtoattractmoreretailersbyofferingthemfreedeliveryserviceforamonth.Alibabaitselfhasinvitedsome30000offlinestorestoparticipateintheonlineshoppingparty.Morethan20000vendorsonAlibaba'ssites﹣﹣TmallandTaobaoarepromising50percentdiscountsontheday.Shanghai﹣basedYhd.comalsocalledYihaodianaChinesee﹣commercecompanythatismajority﹣ownedbyWal﹣MartStoresissettingupaspecialsaleofimportedfoods. LastyearAlibabaearned19.1billionyuaninsalesduringthedoubleelevenpromotions.Anda100billionyuanlogistics物流networkwassetupbyAlibabathisMaythataimstomake24﹣hourdeliveriespossible. ThemajorlogisticsplayerShentongshippedmorethan8millionitemsduringdoubleeleven.Shentonghasmorethan150000staffandexpectsthingstobeevenbusierthisyear.YangJinghaiDirectorOfHumanResourcesofShentongExpresssaysWehavehired30percentmorestafffordoubleelevenandwehavecouriers'快递员bonusesready. OndoubleelevenChina'se﹣commercesitesreceivemorevisitsthantheentirepopulationofBrazil.ItisbelievedthatChinawillreplacetheUSastheworld'stope﹣commercemarketthisyear. 24.Whatcanweinferfromthesecondparagraph? A.DoubleelevenisanofficialfestivalinChina. B.Mostpeoplewillgoshoppingonlineondoubleeleven. C.DoubleelevenisnolongeraspecialdayforsinglesinChina. D.Onlineretailerswillmakealotofpreparationsbeforedoubleeleven. 25.Whatkindofsituationareyoumostlikelytomeetifyoubuythingsonlineondoubleeleven? A.Youwillgeta50%discount. B.Youwillfindmoregoodsonline. C.Youarenotabletobuyimportedgoods. D.Youcangetfreedeliveryserviceforamonth. 26.Whatdoestheunderlinedwordinthethirdparagraphprobablymean? A.Someonewhosellsthings. B.Someonewhobuysthings. C.Someonewhodeliversthings. D.Someonewhocollectsthings. 27.What'stheauthor'sattitudetowardstheonlineshoppingfestivalonNovember11th? A.Supportive. B.Critical. C.Doubtful. D.Objective.
8分Todaywasaspecialdayforme.Ihadmydoctor'sappointmentsinatownthat'sabout45minutesfromwhereIlive. AftermyappointmentwasdoneIstartedwalkingdownfromthebuildingthroughalongbreezeway有屋顶的过道andInoticedanelderlywomanpacingattheend.Iaskedifshewaswaitingforsomeoneorsheneededassistance. Asitturnedoutshewashavingtroublewalkingthedistanceandhadlookedforastaffmembertopickherup.Noonehadcomeforseveralminutes.IaskedhertositstillwhenIwenttogetawheelchair.Iranfullspeedtothehelpdeskandaskedforone.ThereceptionistandIwalkedtotheendofthebreezewaytotheladywhosaidIwanthertohelpme.Shewasreferringtome.Icarefullyslowlyandattentivelyhelpedthewomanintothewheelchair.Aftershewasseatedshesoftlylookeduptomeandthankedmeformyhelp.HowcouldInothavehelpedher?Ijustwantedhertobealright. WhenIreturnedhomeIcalledmybestfriendtoaskifsheneededme.ShewantedmetotakeherandherboyfriendtotheBoostMobileStore.IdidandafterallwastakencareofItookmyfriendsbackhome.IthankedthemfortheopportunitytohelpthemandthatIappreciatedit.Maybeitmeantlittletothembutalottome. 32.Whywasthedayspecialtotheauthor? A.Becauseshemetherbestfriend. B.Becauseshehelpedastrangeoldlady. C.Becauseshelearnedhowtouseawheelchair. D.Becauseshehadanappointmentwithherdoctor. 33.WhichisTrueaccordingtothepassage? A.Theoldladyhadaheartattack. B.Theauthorhadmettheoldladybefore. C.Theoldlady'swordsinspiredtheauthor. D.Theauthorwentbackwithawheelchairalone. 34.Whydidtheoldladywanttheauthortohelpher? A.Shetrustedtheauthor. B.Shewasnoteasytogetalongwith. C.Shedidn'tknowanybodyexcepttheauthor. D.Shedislikedthereceptionistwhocamewiththeauthor. 35.What'sthebesttitleforthispassage? A.Littlethingsmeanalot B.Godhelpthosewhohelpthemselves C.Betterlatethannever D.Startwellandendwell.
函数fx＝1﹣xlog2x的零点所在区间是
设则abc的大小顺序为
fx是R上的奇函数当x≥0时fx＝x3+ln1+x则当x＜0时fx＝
如图是抛物线y=ax2+2ax+2图象的一部分-30是图象与x轴的一个交点则不等式ax2+2ax+2＞0的解集是
10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. DearJack Howareyoudoing?YouaskmeinyourlastletteraboutmyplanforthecomingNationalDay.IamsorrythatIdidn'twritebackassoonaspossibly.Iwasbusypreparingformyexamatthattimethatwasimportantforme.AsaresultofIhadnochoicebutfocusonmystudy.Ibelievethatifyouweremeyouwillmakethesamechoice.BythewayIhaveafullschedulesformyNationalDay.FirstofallIwillvisitmygrandparents.BesideIwillworkasavolunteerformineschoolasateachingassistant.AtlastIwilltaketheshortcoursetoimproveEnglish. ThisismyplanforNationalDay.What'syours?Iamlookingforwardtoyourearliestreply. Yours Grace.
抛物线y1=-x2+4x和直线y2=2x的图象如图所示那么不等式y1＞y2的解集是
氧气分子在0℃和100℃温度下单位速率间隔的分子数占总分子数的百分比随气体分子速率的变化分别如图中两条曲线所示．下列说法正确的是
一质量为8.00×104kg的太空飞船从其飞行轨道返回地面．飞船在离地面高度1.60×105m处以7.5×103m/s的速度进入大气层逐渐减慢至速度为100m/s时下落到地面．取地面为重力势能零点在飞船下落过程中重力加速度可视为常量大小取为9.8m/s2．结果保留2位有效数字 1分别求出该飞船着地前瞬间的机械能和它进入大气层时的机械能 2求飞船从离地面高度600m处至着地前瞬间的过程中克服阻力所做的功已知飞船在该处的速度大小是其进入大气层时速度大小的2.0%．
下列物质属于溶液的是
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