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下列实验操作、现象与结论对应关系正确的是（ ）
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下列实验操作现象和结论对应关系正确的是
下列实验操作中对应的实验现象以及实验结论都正确且两者具有因果关系的是
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D
下列实验操作现象与结论对应关系不正确的是
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下列实验操作现象与结论对应关系正确的是
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下列实验操作现象与结论对应关系正确的是
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下列实验操作现象与结论对应关系不正确的是
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B
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D
下列实验操作现象与结论对应关系正确的是
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B
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D
下列实验操作及现象与结论对应关系正确的一组是
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B
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D
下列实验操作现象与结论对应关系正确的是
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B
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D
下列实验操作现象与结论对应关系正确的是
2.00分下列实验中操作及现象与结论对应关系正确的一组是
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B
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D
下列实验操作现象与结论对应关系正确的是
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下列实验操作和现象与结论对应关系正确的是
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D.
下列实验操作和现象与结论对应关系正确的是
下列实验操作现象与结论对应关系正确的是
下列实验操作和现象与结论对应关系正确的是
下列实验操作现象与结论对应关系正确的是
A
B
C
D
下列实验操作现象与结论对应关系正确的是
下列实验操作现象与结论对应关系正确的是
下列实验操作现象和结论均正确且存在对应关系的是
A
B
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D
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Inourdailylifesomepeopleprefertoholdontothepastandplayitagainandagainlikeabrokenrecord.1.Howeverthosewithnoregretsletgoofthepastandlivejoyfullyatpresent.Theyalsolivebythefollowingprinciples. 1.Followingyouruniquepathleadstogreaterachievements. Weallhavepassionsandinnerguidance.Ifyoufollowyourpassionsandinnerguidanceyourlifewilltakeondeepermeaningandfulfillment.2. 2.Letyourinterestguideyounotsocietalpressures. Weallknowthefeelingofbeinginterestedaboutsomething.3.Buttoooftenweallowsocietalpressurestocontrolourfeeling.Tocheckwhetheryourinterestisguidingyourlifestartdoingwhatyouwantto. 3.Understandinghappinessisachoice. Weoftenthinkwewillbehappyoncewegetthatjoborfinishthatcourse.4.Everythingoutsideofyouistemporary暂时的.Onceitgoessowillyourhappiness. 4.5. Wesupportothersbyourwordsandactionswhilereceivingothers'supportandloveback.Expressingheartfeltfeelingsallowsustohavenoregretsforwhatevertomorrowmaybring.Itmayalsobeexactlywhatothersneedtofacetheircurrentchallenges. A.Don'tthinktwiceaboutexpressingloveandappreciation B.Trylivingaccordingtowhatyourinnerknowingguidesyoutodo C.Whatisrightforonepersonmaynotberightforanother D.Theyinturnlivewithregretangerandfear E.Don'tsettleforlessthanwhatyouwant F.Thetruthisthathappinesscomesfromwithin G.Itguideswhatwearedoing
如图学校教学楼上悬挂一块长为3m的标语牌即CD＝3m．数学活动课上小明和小红要测量标语牌的底部点D到地面的距离．测角仪支架高AE＝BF＝1.2m小明在E处测得标语牌底部点D的仰角为31°小红在F处测得标语牌顶部点C的仰角为45°AB＝5m依据他们测量的数据能否求出标语牌底部点D到地面的距离DH的长若能请计算若不能请说明理由图中点ABCDEFH在同一平面内参考数据tan31°≈0.60sin31°≈0.52cos31°≈0.86
整数a满足下列两个条件使不等式﹣2≤＜a+1恰好只有3个整数解使得分式方程+＝1的解为整数则所有满足条件的a的和为
在一个不透明的箱子里有四张外形相同的卡片・卡片上分别标有数字﹣1135．摸出一张后记下数字再放回摇匀后再摸出一张记下数字．以第一次得到的放字为横坐标第二次得到的数字为纵坐标得到一个点则这个点．恰好在直线y＝﹣x+4上的概率是．
计算+tan30°tan30°0﹣﹣2＝．
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在Rt△ABC中∠ACB＝90°D是△ABC内一点连接ADBD．在BD左侧作Rt△BDE使∠BDE＝90°以AD和DE为邻边作▱ADEF连接CDDF． 1若AC＝BCBD＝DE． ①如图1当BDF三点共线时CD与DF之间的数量关系为． ②如图2当BDF三点不共线时①中的结论是否仍然成立请说明理由． 2若BC＝2ACBD＝2DE＝且ECF三点共线求的值．
一组数据13﹣234的中位数是
如图在Rt△ABC中∠ACB＝90°CA＝CB＝2D是△ABC所在平面内一点以ABCD为顶点的四边形是平行四边形则BD的长为．
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下列运算正确的是
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在平面直角坐标系中点﹣52所在的象限为
3的相反数是
﹣的值估计在
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若一个等腰三角形的两边长分别为24则第三边的长为
如图点EF分别在正方形ABCD的边CDBC上且DE＝CF点P在射线BC上点P不与点F重合．将线段EP绕点E顺时针旋转90°得到线段EG过点E作GD的垂线QH垂足为点H交射线BC于点Q． 1如图1若点E是CD的中点点P在线段BF上线段BPQCEC的数量关系为． 2如图2若点E不是CD的中点点P在线段BF上判断1中的结论是否仍然成立．若成立请写出证明过程若不成立请说明理由． 3正方形ABCD的边长为6AB＝3DEQC＝1请直接写出线段BP的长．
先化简再求值÷a﹣其中a＝2b＝2﹣．
抛物线y＝x+32﹣4的对称轴为
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一个小球在如图所示的方格地板上自由滚动并随机停留在某块地板上每块地板大小质地完全相同那么该小球停留在黑色区域的概率是．
Doyoufinditdifficulttoputdownyourmobilephone? Ifyesyou'renotalone.ThesedaysmanypeoplesufferfromthestressofFOMOfearofmissingout.Theyreachfortheirmobilephoneswhentheywakeupinthemorningandfortherestofthedaytheyconstantlyscrolldown向下滚动thetimelinesoftheirsocialmediaappstogetthelatestupdates. Despitetheconveniencesmartphonesbringmanypeoplestrugglewiththeirdigitalhabits. AsSameerSamatUStechCompanyGoogle′svicepresidentofproductmanagementsaidinhisspeechatthe2018GoogleI/OdeveloperconferenceonMay870percentofpeopledon'twanttospendsomuchtimeontheirphones. ThisiswhyduringtheconferenceGoogleintroducedanappcalledDashboardforthenewversion版本ofitsAndroidoperatingsystem.Thisnewappincludeswell﹣beingfunctionsthataimtohelpusersmanagethetimetheyspendontheirdigitaldevices. Itallstartswithabird′s﹣eyeview.Dashboardallowsuserstolookatallthedetailsoftheirphonehabits.Forexampleausercanseehowmanytimesthey′veunlockedtheirphoneandhowmanytimesthey′vecheckedtheirsocialmediaappsaswellashowmuchtimetheyspendoneachappeveryday. Oncetheusersseethisinformationthey'llbeabletomakesomedianges.WiththeAppTimerfunctionuserscansetatimelimitforhowlongtheycanuseeachappforeveryday.Afterthey'vehitthelimittheywon'tbeabletolaunchtheappuntilthenextday. Butevenifusersbecomemoremindfuloftheirusagethey'restilllikelytobedrawninbynotifications通知.ThisiswheretheShushfeaturecomesin.Itautomatically自动地silencesincomingcallsandnotificationswhenauserputstheirphonefacedown. Ifpeopletrulywanttomakefulluseoftheirfreetimeinsteadoflosinghoursusingtheirsmartphonesthesenewfunctionsarejustonewayofdoingthat. Afterallwhoneedstouseanapptostopyoufromusingotherappswhentheeasiestanswerwouldbejusttouseyourwillpower? 1WhoarethetargetusersofDashboard? A.Peoplewhoknowlittleaboutsmartphones. B.Peoplewhohavetroubledealingwithstress. C.Peoplewhoareslowatsearchingforthingsonline. D.Peoplewhowishtomanagethetimetheyspendontheirsmartphone. 2WhatcanDashboarddo? A.Lockthephoneatacertaintime. B.Limitsomeappstocertainusers. C.Limitthetimecertainappscanbeused. D.Silenceappnotificationsatnight. 3TheunderlinedwordmindfulinParagraph8isclosestinmeaningto. A.serious. B.careful. C.prepared. D.creative. 4WhatdoestheauthorthinkofDashboard? A.It'snotveryuseful. B.It'sperfectlydesigned. C.Itshouldincludemorefunctions. D.Itmaybehelpfultosomepeople.
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