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请根据你对以下两幅图的理解,以"Many Hands Make Light Work."为题,用英语写一篇作文. 参考词汇: wind﹣blown trees (被风刮倒的树) lift up (...
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高三下学期英语《》真题及答案
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一个半圆的周长是20.56分米这个半圆的面积是41.12平方分米．判断对错
乙酰水杨酸阿司匹林是目前常用药物之一．实验室通过水杨酸进行乙酰化制备阿司匹林的一种方法如图 实验过程在100mL锥形瓶中加入水杨酸6.9g及醋酸酐10mL充分摇动使固体完全溶解．缓慢滴加0.5mL浓硫酸后加热维持瓶内温度在70℃左右充分反应．稍冷后进行如下操作． ①在不断搅拌下将反应后的混合物倒入100mL冷水中析出固体过滤． ②所得结晶粗品加入50mL饱和碳酸氢钠溶液溶解过滤． ③滤液用浓盐酸酸化后冷却过滤得固体． ④固体经纯化得白色的乙酰水杨酸晶体5.4g． 回答下列问题 1该合成反应中应采用加热．填标号 A．热水浴B．酒精灯C．煤气灯D．电炉 2下列玻璃仪器中①中需使用的有填标号不需使用的有填名称． 3①中需使用冷水目的是． 4②中饱和碳酸氢钠的作用是以便过滤除去难溶杂质． 5④采用的纯化方法为． 6本实验的产率是%．
在横线上填上＞＜或＝． × × ×
求下列图形的周长．
用同样长铁丝围成长方形正方形和圆形则围成的面积最大．
磷酸亚铁锂LiFePO4可用作锂离子电池正极材料具有热稳定性好循环性能优良安全性高等特点文献报道可采用FeCl3NH4H2PO4LiCl和苯胺等作为原料制备．回答下列问题 1在周期表中与Li的化学性质最相似的邻族元素是该元素基态原子核外M层电子的自旋状态填“相同”或“相反”． 2FeCl3中的化学键具有明显的共价性蒸汽状态下以双聚分子存在的FeCl3的结构式为其中Fe的配位数为． 3苯胺的晶体类型是．苯胺与甲苯的相对分子质量相近但苯胺的熔点﹣5.9℃沸点184.4℃分别高于甲苯的熔点﹣95.0℃沸点110.6℃原因是． 4NH4H2PO4中电负性最高的元素是P的杂化轨道与O的2p轨道形成键． 5NH4H2PO4和LiFePO4属于简单磷酸盐而直链的多磷酸盐则是一种复杂磷酸盐如焦磷酸钠三磷酸钠等．焦磷酸根离子三磷酸根离子如图所示 这类磷酸根离子的化学式可用通式表示为用n代表P原子数．
XYZ均为短周期主族元素它们原子的最外层电子数之和是10．X与Z同族Y最外层电子数等于X次外层电子数且Y原子半径大于Z．下列叙述正确的是
化学与生活密切相关．下列叙述错误的是
某工地有54吨水泥用去了还剩多少吨
一辆汽车3小时行150千米这辆汽车所行的路程与时间的比是比值是这个比值表示．
500千米的是．
计算下面图形的周长是cm．
圆的半径和直径有无数条．判断对错
3只燕子2天共吃了522只害虫．平均每只燕子每天吃害虫多少只
一项建筑工程有三个队都想承包． 甲队说“我在保证工程质量的前提下240天一定完成任务而且工钱优惠．” 乙队说“我的质量只有比甲队好绝不比他差而且工钱也相同．但是我的工期只比他的多5天．” 丙队说“别的都和他们相同就是工期不同我保证比他们两队工期之和的少30天．” 哪个队工期最短
圆的半径扩大2倍它的周长就
÷12＝
下图每个小正方形的边长表示1厘米请按要求画图形． 1把图①按21的比放大． 2把图①绕B点逆时针旋转90度． 3在A点南偏东45°方向画一个直径4厘米的圆．
ThisisatruestoryofMother'sSacrificeduringtheJapanEarthquake.Aftertheearthquaketherescuersreachedtheruinsofayoungwoman'shouse.Theysawherdeadbodythroughthecracks.Howeverher1wasstrangeasshekneltonherkneesherbodywas2forwardandhertwohandsweresupportedbyanobject.Thecollapsedhousehad3onherbackandhead. Withmanydifficultiestheleaderoftherescueteamputhishand4anarrowgaponthewalltoreachthewoman'sbody.Hewas5thatthiswomanwouldbestillalive.Howeverthecoldandstiffbodytoldhimthatshehadpassedaway6 Heandtherestofthe7leftthehouseandweregoingtosearchthenextcollapsedbuilding.Forsomereasontheteamleaderwas8byaforcetogobacktothehouseforthedeadwoman.Thistimehecarefullypassedhishandthroughthe9crackstosearchthelittlespaceunderthedeadbody.Suddenlyhescreamedwith10Achild!Thereisachild! Thewholeteamworkedtogether.Theycarefully11thepilesofruinedobjectsaroundthedeadwoman.Therewasathree﹣month﹣oldboy12inhismother'sbody.13thewomanhadusedherbodytoprotecthersonwhenthehousecollapsed.Thelittleboywasstillsleeping14whentheteamleaderpickedhimup. Themedicaldoctorcamequicklytoexaminethelittleboy.15heopenedtheblankethesawacellphoneinsidetheblanket.Therewasatext16onthescreen.ItsaidIfyou17youmustrememberthatIloveyou.Thiscellphonewaspassedaroundfromonehandtoanotheramongtherescuers.Everybodythatreadthemessage18Asisknownitismother's19lovethatprotectsusfromcoldandhungerbutatcertain20pointsitismother'slovethatsheltersusfromdangeranddeath. 1A.expression B.position C.pose D.behavior 2A.placing B.leaning C.falling D.relying 3A.stood B.covered C.slipped D.crashed 4A.across B.beyond C.through D.beneath 5A.hoping B.confirming C.determining D.predicting 6A.inadvance B.forsure C.onpurpose D.inhorror 7A.team B.villagers C.doctors D.volunteers 8A.arouse B.attacked C.grasped D.driven 9A.broad B.smooth C.narrow D.deep 10A.sorrow B.excitement C.satisfaction D.disappointment 11A.removed B.discovered C.wrapped D.folded 12A.delivered B.blocked C.held D.treasured 13A.Unfortunately B.Obviously C.Coincidently D.Hopefully 14A.helplessly B.unconsciously C.peacefully D.bitterly 15A.Until B.Since C.Before D.After 16A.telephone B.letter C.information D.message 17A.survive B.wake C.live D.spot 18A.relieved B.sighed C.signed D.wept 19A.unconditional B.permanent C.fundamental D.unbearable 20A.meaningful B.critical C.controversial D.influential
解方程 1x÷1﹣40%＝3.6 2x﹣25%x＝12．
StrongwindsandcoldtemperaturestestedNewYorkCityMarathonrunnersonSunday.Despitethetoughconditionsabout50000peoplecompletedthe26.2﹣milecourse.Theywound曲折而行theirwayfromthestartinglineinStatenIslandthroughBrooklynQueensandtheBronxtowardthefinishlineinManhattan'scentralPark. WilsonKipsangfromKenyawonthemarathonin2hours10minutes59seconds.BecauseofthewindhistimewastheslowestwinningtimeinNewYorksince1995.itwasmorethan7andahalfminutesofftheworldrecordhesetjustoverayearagoinBerlin.Therunnersadjustedcarefullyto30mphwindsbystickingtoaslowpaceatthestart. KeitanyalsofromKenyawonthewomen'stitlewithafinaltimeof22507.InherpreviousNYCMarathonKeitanytookanearlyleadbutthisyearsheheldback.SheandKenya'sJemimaSumgongenteredCentralParksidebysideandSumgongappearedtobepullingawaywithjustoveramileleft.ButKeitanyhadonelastburstleftandwonby3seconds.Itwasthetightestfinishinthehistoryofthewomen'srace.IntheclosingmilesmytargetwastowinSumgongsaidbutitwasKeitany'sday. TheNewYorkCityMarathonhasgrownfromaCentralParkracewith55finisherstotheworld'sbiggestandmostpopularmarathon.Sundaywasthe44theditionoftheNYCMarathon.Theracehaditsmillionthfinisherinhistory. Keitanyatwo﹣timeLondonMarathonchamphadn'truna26.2﹣mileracesince2012becauseofthebirthofhersecondchild.Iworkedhardforthisopportunityshesaid.I'mhappybecauseIhaveavictorytoday. 1HowdidWilsonKipsangperformatthe44thNYCMarathon? A.Hewasthefirstmantoreachthefinishline. B.Hefinishedthecourseinlessthantwohours. C.Heranatafastpacefromtheverybeginning. D.Hesettheworstrecordinhismarathonhistory. 2Atthe44thNYCMarathonMaryKeitany. A.wonbyoveramile B.tookanearlyleadasusual C.didn'twinaneasyvictory D.beattheformerworldrecordholder 3WhatisParagraph4mainlyabout? A.ThepurposeoftheNYCMarathon. B.TheimportanceoftheNYCMarathon. C.TheuniquenessoftheNYCMarathon. D.ThedevelopmentoftheNYCMarathon.
两个相同的半圆拼成一个整圆后它的
设NA为阿伏加德罗常数值．关于常温下pH＝2的H3PO4溶液下列说法正确的是
OneinfourBritonswouldnottrusttheirneighborstotakedeliveryofaparceland10percentsuspectthemofhavingstolenaparcelinthepastasurveyhasfound. Astudyof2000showsthatbarelyhalfofpeopleknowwhotheirneighborsare.Amajoritywouldneverasktheirneighborstolookaftersuchthingsaskeys68percentpets89percentwhiletheywereoutandeventakinginparcelsistakingtrusttoofarformorethanathirdofus35percentaccordingtoresearchforInPostUK. Oneinten11percenthavehadparcelstakenbyaneighbororfromrightoutsidetheirhouse.Whenitcomestodeliveriesalmostaquarter26percenthavegoneintoworklateorhaveleftearlytowaitinforaparcel.ThisgivesrisetopeoplequeuinginthePostOfficemorethan20minutestopickuporsendaparcel. AsaresultshoppersarelookingformoreconveniencethisChristmas.While83percentwillstillgetgiftssenttotheirhomeoneinfive19percentwillhaveparcelsdeliveredtotheirofficeand33percentwillclickandcollectinstoreorfromanearbyshop. Inadditionalmosttwothirdsofonlineshoppers64percentareconsideringusingparcellockersbecausetheyprovidealocal24/7service. JonathanSmithchairmanatInPostUKsaidIt'ssurprisingthatpeopledon'ttrustthoseclosesttothemtohelpthemoutandtoseethatmisseddeliveriesarestillsuchanissueespeciallyasweheadintothepeakshoppingperiod. 1What'stheproblemofBritishdeliveryparcels? A.Theyarealwaysstolenbystrangers. B.Somemissingparcelsaresuspectedtobetakenbyneighbors. C.Mostoftheparcelshavetobepickedupinthepostoffice. D.Deliveriesalmostcause50%goingintoworklateorleavingearly. 2Accordingtothepassagewecanlearnthat. A.merelyhalfofpeopleknowtheirneighbors B.onlyoneinfourBritonstrusttheirneighborstotakedeliveryofaparcel C.amajoritywouldasktheirneighborstolookaftertheirpets D.twothirdsofonlineshoppersstillgettheirparcelssenttotheirhome 3What'stheattitudeofJonathanSmithtowardstheissue? A.Unexpected. B.Critical. C.Overstate. D.Optimistic. 4What'sthebesttitleforthepassage? A.ThedeliveryprobleminBritain B.Howcanwetrusteachother C.Thetrustcrisis危机inneighborhoodsinBritain D.Thewaytoimprovedelivery
为提升电池循环效率和稳定性科学家近期利用三维多孔海绵状Zn3D﹣Zn可以高效沉积ZnO的特点设计了采用强碱性电解质的3D﹣Zn﹣﹣NiOOH二次电池结构如图所示．电池反应为Zns+2NiOOHs+H2OlZnOs+2NiOH2s．下列说法错误的是
一块花布长20米做衣服用去后剩下几分之几还剩下多少米
脱式计算．能简算的要简算 ×11﹣× 3﹣÷ ×125 ÷7+× × 3×﹣
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求一个不为0的数的倒数只要把分子和分母交换位置就可以了．判断对错
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