专题一专题二专题三章末小结知识整合与阶段检测专题归纳例析阶段质量检测专题冲关1返回2返回3返回专题一电场线与磁感线的比较(1)相似之处:①电场线和磁感线都是为了形象地描述场而引入的假想的曲线,实际上并不存在。②电场线和磁感线都是用来描述场的强弱和方向的,电场线和磁感线切线方向分别表示了电场和磁场的方向。4返回③电场线和磁感线都不能相交。因为如果相交,在相交点就会出现两个切线方向,与电场和磁场中某一确定...
12一、抽样方法抽样方法有:简单随机抽样、系统抽样、分层抽样.简单随机抽样有抽签法、随机数表法.31.抽签法的步骤(1)编号:给总体中所有的个体编号(号码可以从1到N);(2)制签:将1~N这N个号码写在形状、大小都相同的号签上;(3)搅拌:将号签放在一个容器中,搅拌均匀;(4)抽签:每次从容器中不放回地抽取一个号签,并记录其编号,连续抽取n次;(5)取样:从总体中,将与抽到的号签编号一致的个体取出.42.系统抽样的步骤从...
DefeatDisabilityYangsambitionwastogetanarchitectcertificateorbecomeabowlingmaster.Butwhenhewasconductingexperimentswithamicroscopeinthebasement,atankonthebenchexploded,sendinghimflyingoutwardsthroughtheexit.Hewasoutofbreathwhenknowinghelosthiseyesightaswellas70%ofhishearing.Inotherwords,hewasdisabled.1Feelingclumsy,hewasannoyedatfirstthoughnobodymadefunofhim.Hecutoutgoingoutdoorsandjustsataroun...
ProtectingtheenvironmentEnvironmentalproblemsarebecomingmoreandmoreseriousallovertheworld.Astheworldbecomesmorecrowded,wearerunningoutofournaturalresourcesmorequickly.Inparticular,wearepollutingourenvironment.Largequantitiesofpoisonousgasarebeingletoffintotheatmosphere,andothertypesofwasteareflowingintothewater.1Moreover,forestshavedecreasedbecausemanytreesarebeingcutdown.Asisknowntous,treescan...
Ihaveagoodfriend,whoisamusicianandcomposer.Heshowedagreattalentformusicfromanearlyage.Hedreamedofbecomingaconductorandforminghisownbandwhenhewasyoung.Atsix,hewenttothecourtofaprincetolearnmusic,wherehemadeanoteoforevenrecordedwhathewastaught.Heimpressedhisteacherwithhardwork.Heespeciallylovedclassicalandjazz.Later,hecomposedmanycatchyballadsandtouredthroughouttheworld.Hemixedwesternmusicwit...
Inawaycomputerscanbeconsideredatechnologicalrevolutionbecausetheyhave“artificialintelligence”sothattheycansimplifydifficultsums,“think”logicallyandsolveanydifficultmathematicalproblem.Withthedevelopmentofthenetwork,computershavebecomeveryimportantincommunication,financeandtrade,andpeopleallovertheworldcansharetheirknowledgewithothersthrough1theWorldWideWeb.Nowadaysboysandgirlsevenusetheirmo...
1重点单词重点短语重点句型重点语法交际功能1.journaln.日记;杂志;定期刊物→n.记者2.transportn.vt.运输;运送→n.交通(总称)3.prefervt.更喜欢;选择某事物→adj.较适合的;更可取的→n.偏爱;爱好;喜爱4.n.不利条件;不便之处→n.(反义词)5.persuadevt.说服;劝说→n.劝服→adj.劝说的;有说服力的6.graduatevi.毕业n.大学毕业生→n.毕业7.adv.最后;终于8.organizevt.组织;成立→adj.有组织的→n.组织journalisttransportationprefe...
1重点单词重点短语重点句型重点语法交际功能1.adj.心烦意乱的;不安的;不适的vt.使不安;使心烦2.ignorevt.不理睬;忽视→n.不理睬;忽视;无知→adj.无知的3.vt.vi.(使)平静;(使)镇定adj.平静的;镇静的;沉着的4.concernvt.(使)担忧;涉及;关系到n.担心;关注;(利害)关系→adj.担心的;关心的→prep.关于5.adv.在户外;在野外6.entireadj.整个的;完全的;全部的→adv.完全地;全然地;整个地7.powern.能力;力量;权力→adj.强大的;upsetignor...
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八年级上册第十二章小结与复习1•学习目标:1.复习本章的重点内容,整理本章知识,形成知识体系.2.巩固和运用全等三角形的相关知识解决问题,进一步发展推理能力.•学习重点:复习全等三角形判定、性质及角平分线的性质和判定,建立本章知识结构;运用全等三角形的知识解决问题.学习说明2问题1请同学们回答下列问题:(1)你能举出一些实际生活中全等形的例子吗?(2)举例说明全等三角形有什么性质?(3)从三角形的三条...
BeCarefulaboutCloningAfteraseriesofinitialexperimentsandcorrections,thescientist’shardworkpaidoffwhenthetwincloneturkeyswerehatchedwithnormalfeatherandclaws.Thisbreakthroughpossiblyenabledpeopletobringtheiradoredpetsbacktolife.However,itbotheredhimfromtimetotimethattheirhealthwasinpoorconditionbecausetheywereunabletoresistillnesses.Thisdrawbackcasthimdown.Merely2weekslater,theclonesandtheircar...
主观题题型技法指导第一讲《经济生活》《政治生活》主观题命题分析、失分探因及应对策略1一、高考38题、39题命题分析2017年前,思想政治学科高考命题强调题型结构的稳定性,逐步形成了两道主观题,即一道为经济和政治搭配的综合题,一道为文化和哲学搭配的综合题的固定模式。经过数年的实际运用,这一固定搭配逐步暴露出难以与真实情境相契合的问题。一些经济生活、政治生活或者文化生活的材料,可能非常适合各自知识能力的考查...
12一、雅典贵族政治、僭主政治和民主政治含义评价贵族政治是指少数贵族集体的统治,普通民众没有权力参与政府的运作贵族利用特权大肆侵吞平民的土地和财产,剥夺平民的人身自由,导致社会矛盾的激化,但贵族政治废除了个人独裁,建立了集体统治的原则,不同于君主制僭主政治是指用武力夺取政权而建立的个人独裁统治僭主统治期间,为稳定社会秩序,巩固统治地位,实行鼓励发展工商业、打击贵族势力的措施,为民主政治的形成创造...
1一、倒幕运动和尊王攘夷运动的异同项目内容倒幕运动尊王攘夷运动不同点斗争力度斗争矛头直指封建幕府统治借尊王之名,行倒幕之实结果最终推翻了封建幕府统治,取得胜利在国内外反动势力联合绞杀下失败相同点背景民族危机加剧;幕府腐朽的专制统治领导者中下级武士性质带有浓厚的尊王思想斗争对象外国侵略者和封建幕府2二、明治维新改革的内容和影响措施内容影响政治——废除旧体制建立新体制“废藩置县”,建立起中央集权体制...
NowadaysEnglishisaninternationallanguage.EnglishismadeupofthegrammarandvocabularybroughttoBritainbypeoplefromdifferentcountriesandcultures.OldEnglishconsistsofCeltic,andthelanguagesoftheAnglesandtheSaxons,whichoccupiedBritain,andtheVikings.Bythe10thcentury,OldEnglishbecametheofficiallanguageofEngland.1TheNormans,whodefeatedEnglandandtookcontrolofthecountryin1066,madethemostcontributionstoMiddle...
1[高考真题体验]1.[多选](2015全国卷Ⅱ)指南针是我国古代四大发明之一。关于指南针,下列说法正确的是()A.指南针可以仅具有一个磁极B.指南针能够指向南北,说明地球具有磁场C.指南针的指向会受到附近铁块的干扰D.在指南针正上方附近沿指针方向放置一直导线,导线通电时指南针不偏转2解析:BC指南针为一具有磁性的物体,有两个磁极,A错误;指南针能指南北,说明指南针受到地磁场的作用,B正确;当有铁块存在时,指南针会与...
Itssaidthatdinosaursdiedoutbecauseofanunexpectedincident.Butwildlifetodaydisappearsorisindangerjustbecausehumansdoharmtoit.Forexample,tigersarehuntedforfurtomakecarpetssothattheyonlyliveinsecurereserves;grasslandisdestroyedwithoutmercysothatduststormscomeintobeingaffectingdistantcities.1Lastyear,scientistssawsomemonkeysrubbingthemselveswithacertainkindofinsectstoprotectthemselvesfromfiercemosqu...
小结与复习第八章运动和力1一、力和运动的关系运动状态不改变匀速直线运动状态静止状态运动状态发生改变不受力受平衡力受非平衡力物体受力情况物体运动情况知识梳理21.牛顿第一定律2.惯性一切物体在没有受到力的作用时,总保持静止状态或匀速直线运动状态。●惯性是物体固有的一种属性;●物体在任何情况下都具有惯性;●物体的惯性只跟物体的质量有关;●跟物体的运动情况无关。一切物体都有保持原来运动状态不变的性质,我...
Whichareyouinterestedin,botany,biology,biochemistry,zoology,geneticsorcosmology?Therearebrilliantscientistsineveryfield.Today,Illintroduceoneofthemtoyou.DrYuanLongpingisaleadingfigureinChinasagriculturalresearch.DrYuanisknownforhissuperhybridriceandhasbeenawardedseveraltimes.Born,broughtupandeducatedinChina,DrYuanknewthatmanypeoplesufferedfromhunger.Alotofthemevenearntheirlivingbybegging.1Attha...
Wehavebeenfamiliarwith3Gmobilephoneand3DTV.NowletsexperienceRealCine—virtualrealityfilm,whichwillamazeyou.RealCineworksbymakingtheusersfeelthattheyarereallyinanewworld.Toachievethis,specialVRheadsetsaredesignedtoallowtheuserstoseein3Dandhearthesoundallaroundthem.ToaddtothevirtualworldofRealCine,theheadsetsevenhavesmallopeningsthatgiveoutsmellstomatchtheenvironment.1Boththeheadsetsandthespecial...