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判断下列各图中的∠1和∠2是否是同位角？是哪两条直线被哪条直线所截？
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两条直线被第三条直线所截下列条件中不能判断这两条直线平行的的是
同位角相等
内错角相等
同旁内角互补
同旁内角相等
判断下列各图中的∠1与∠2是否是内错角是哪两条直线被哪条直线所截
判断下列各图中的∠1与∠2是否是同位角是哪两条直线被哪条直线所截
下列命题中不正确的是_________.[]
两条直线被第三条直线所截，如果同位角相等，那么这两条直线平行
两条直线被第三条直线所截，如果同旁内角互补，那么这两条直线平行
两条直线被第三条直线所截，那么这两条直线平行
如果两条直线都和第三条直线平行，那么这两条直线也互相平行
下列命题是真命题的是
如果a
2
=b
2
，那么a=b
如果两个角是同位角，那么这两个角相等
相等的两个角是对项角
平面内，垂直于同一条直线的两条直线平行
判断下列各图中的∠1与∠2是否是同旁内角是哪两条直线被哪条直线所截
下列说法中是平行线的性质的是①两条直线平行同旁内角互补②同位角相等两直线平行③内错角相等两直线平行
①
②和③
④
①和④
判断下列各图中的∠1与∠2是否是内错角是哪两条直线被哪条直线所截
给出下列说法1两条直线被第三条直线所截同位角相等2平面内的一条直线和两条平行线中的一条相交则它与另一
0个
1个
2个
3个
判断下列各图中的∠1与∠2是否是内错角是哪两条直线被哪条直线所截
下列四个命题是真命题的是
同位角相等；
如果两个角的和是180度，那么这两个角是邻补角；
在同一平面内，平行于同一条直线的两条直线互相平行；
在同一平面内，垂直于同一条直线的两条直线互相垂直。
下列命题中正确的是
在同一平面内，垂直于同一条直线的两条直线平行；
相等的角是对顶角；
两条直线被第三条直线所截，同位角相等；
和为180°的两个角叫做邻补角。
判断下列各图中的∠1与∠2是否是内错角是哪两条直线被哪条直线所截
判断下列各图中的∠1和∠2是否是同位角是哪两条直线被哪条直线所截
判断下列各图中的∠1与∠2是否是同旁内角是哪两条直线被哪条直线所截
下列命题中真命题是
相等的角是直角
不相交的两条线段平行
两直线平行，同位角互补
经过两点有且只有一条直线
下列命题中真命题的个数为.①在同一平面内两条直线被第三条直线所截同位角相等②两条平行线被第三条直线所
4
3
2
1
判断下列各图中的∠1和∠2是否是同位角是哪两条直线被哪条直线所截
判断下列各图中的∠1与∠2是否是同旁内角是哪两条直线被哪条直线所截
判断下列各图中的∠1与∠2是否是同旁内角是哪两条直线被哪条直线所截
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已知圆C过点且与直线相切 I求圆心C的轨迹方程 IIO为原点圆心C的轨迹上两点MN不同于点O满足已知证明直线PQ过定点并求出该定点坐标和△APQ面积的最小值．
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8分Mycolortelevisionhasgivenmenothingbutaheadache.IwasabletobuyitalittleoverayearagobecauseIhadmyrelativesgivememoneyformybirthdayinsteadofalotofclothesthatwouldn'tfit.IletasalesclerkfoolmeintobuyingadiscontinuedmodelIrealizedthisadaylatewhenIsawnewspaperadvertisementsforthesetatseventy﹣fivedollarslessthanIhadpaidThesetworkedsobeautifullywhenIfirstgotithomethatIwouldkeepitonuntilstationssignedoffforthenightFortunatelyIdidn'tgotanychannelsshowingall﹣nightmoviesorIwouldneverhavegottentobed. ThenIstarteddevelopingaproblemwiththesetthatinvolvedstatic静电noise.Forsomereasonwhencertainshowsswitchedintoacommercialaloudnoisewouldsoundforafewseconds.GraduallythisnoisebegantoappearduringashowandtogetridofitIhadtochangetoanotherchannelandthenchangeitback.SometimesthistechniquewouldnotworkandIhadtopickupthesetandshakeittoremovethesound.Iactuallybegantobuildupmyarmmuscles肌肉shakingmyset. WhenneitherofthesemethodsremovedthestaticnoiseIwouldsithelplesslyandwaitforthenoisetogoaway.AtlastIendeduphittingthesetwithmyfistanditstoppedworkingaltogether.Mytriptotherepairshopcostme$62andthesetisworkingwellnowbutIkeepexpectingmoretrouble. 21.WhydidtheauthorsayhewasfooledintobuyingtheTVset? A.Hegotanoldermodelthanhehadexpected. B.Hecouldn'treturnitwhenitwasbroken. C.Hecouldhaveboughtitatalowerprice. D.Hefailedtofindanymovieshowsonit. 22.WhichofthefollowingcanbestreplacethephrasesignedoffinParagraph1? A.endedalltheirprograms B.providedfewerchannels C.changedtocommercials D.showedall﹣nightmovies 23.HowdidtheauthorfinallygethisTVsetworkingagain? A.Byshakingandhittingit. B.Byturningitonandoff. C.Byswitchingchannels. D.Byhavingitrepaired. 24.Howdoestheauthorsoundwhentellingthestory? A.Curious B.Anxious C.Cautious D.Humorous.
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将分裂旺盛的动物细胞阻断在G1/S期交界处更换培养液使其恢复分裂能力从而使所有细胞的分裂同步化之后每隔2h取样一次用流式细胞仪检测细胞内DNA含量结果如图所示下列分析正确的是
下列关于细胞结构与功能相适应的叙述不正确的是
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2016年全国两会即中华人民共和国第十二届全国人民代表大会第四次会议和中国人民政治协商会议第十二届全国委员会第四次会议分别于2016年3月5日和3月3日在北京开幕．为了解哪些人更关注两会某机构随抽取了年龄在15～75岁之间的100人进行调查并按年龄绘制的频率分布直方图如图所示其分组区间为[1525[2535[3545[5565[6575]．把年龄落在区间[1535和[3575]内的人分别称为“青少年人”和“中老年人”经统计“青少年人”和“中老年人”的人数之比为911． 1求图中ab的值根 2若“青少年人”中有15人关注两会根据已知条件完成下面的2×2列联表根据此统计结果能否有99%的把握认为“中老年人”比“青少年人”更加关注两会 附参考公式和临界值表 K2＝其中n＝a+b+c+d．
如图所示的简谐运动图象中在t1和t2时刻运动质点相同的量为
10分假如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的以下作文.文中共有10处错误每句中最多有两处.错误涉及单词的增加删除或修改. 增加在缺词处加一个漏词符号∧并在此符号下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错词下面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. OnedaylittleTonywenttoashoppingcenterwithhisparent.Itwasverycrowded.Tonysawatoyonashopwindow.Helikeditsoverymuchthathequicklywalkedintotheshop.Afterlooksatthetoyforsometimeheturnedaroundandfoundwherehisparentsweremissing.Tonywasscaredandbeguntocry.Awomansawhimcryingandtellinghimtowaitoutsideashop.Fiveminuteslater.Tonysawparents.MomsaidHownicetoseeyouagain!DadandIwereterribleworried.Tonypromisedherthatthiswouldneverhappenagain.
30分Wheredoyougowhenyouwanttolearnsomething?Afriend?Atutor?Theseareall41acesoflearning.Butitmaywellbethatthelearningyoureallywant42somewhereelseinstead.Ihadthe43ofseeingthisfirsthandona44. Mydaughterplaysonarecreationalsoccerteam.Theydidverywellthisseasonandso45atournamentwhichnormallywasonlyformoreskilledclubteams.Thisledtosome46experiencesonSaturdayastheyplayedagainstteams47trained.Throughthefirsttwogamesher48didnotgetonseriousshotongoal.AsapparentI49seeingmydaughterplayingherbest50stilldefeated. ITseemedthatsomethingclickedwiththe51betweenSaturdayandSunday.Whenthey52fortheirSundaygametheywere53different.Theyhadbegunintegrate融合thekindsofplayandteamworktheyhad54thedaybeforeintotheir55.Theyplayedaggressivelyand56scoredagoal. It57methatplayingagainsttheotherteamwasagreat58momentforallthegirlsontheteam.Ithinkitisageneralprinciple.59isthebestteacher.Thelessonstheymaynotbe60whattheywouldhavegotteninschool.Butarecertainlymorepersonalandmeaningfulbecausetheyhadtoworkthemoutontheirown. 41.A.public B.traditional C.official D.special 42.A.passes B.works C.lies D.ends 43.A.dream B.idea C.habit D.chance 44.A.trip B.holiday C.weekend D.square 45.A.won B.entered C.organized D.watched 46.A.painful B.strange C.common D.practical 47.A.less B.poorly C.newly D.better 48.A.fans B.tutors C.class D.team 49.A.imagined B.hated C.avoided D.missed 50.A.if B.or C.but D.as 51.A.girls B.parents C.coaches D.viewers 52.A.dressed B.showedup C.madeup D.planned 53.A.slightly B.hardly C.basically D.completely 54.A.seen B.known C.heard D.read 55.A.styles B.training C.game D.rules 56.A.even B.still C.seldom D.again 57.A.confused B.struck C.reminded D.warned 58.A.touching B.thinking C.encouraging D.learning 59.A.Experience B.Independence C.Curiosity D.Interest 60.A.harmfulto B.mixedwith C.differentfrom D.appliedto.
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