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1.问题提出人们在检测视力时,都会辨识《标准对数视力表》.既然叫做‘对数视力表”,难道和对数有关系?如果和对数有关系,那么它的背后又有多少“数学内核”?仔细观察《标准对数视力表》就会发现,上面有14行每行不等个数的“E”形图标等距离自上而下排列,旁边标有两列数据,其中五分记录分别为规则的等差数列4.0,4.1,…,5.2,5.3,对应的小数记录却为不规则的数列0.1,0.12,0.15,0.2,0.25,0.3,0.4,0.5,0.6,0.8,1.0,1.2,1.5,2.0。为什么会有这样的设计?我国专门颁布了视力表的国家标准,它的意义究竟何在? 相似文献
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季风 《中学英语园地(高三版)》2003,(1)
Ⅰ.情景对话(5分)根据你所听到的句子,从A,B,C,D中选出最佳答语。1.A.Yes,please.B.Yes,Idloveto.C.No,Iwill.D.Yes,Ilikeit.2.A.Sure.Giveyou.B.Yes,justalittle,please.C.OK.Hereyouare.D.Thankyou.3.A.Imhappyyoulikeit.B.Imsorrytohearthat.C.Yes,Idloveto.D.Imsorry.4.A.Yes,Iwilldoit.B.Thankyou,Iwill.C.Itdoesntmatter.D.Oh,Imsorry.5.A.Thatsright.B.Thatsallright.C.Agoodidea.D.Idontknow.Ⅱ.对话理解(5分)根据你所听到的对话… 相似文献
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季风 《中学英语园地(高三版)》2003,(2)
Ⅰ.对话理解(10分)根据你所听到的对话及问题,从A,B,C,D中选出正确答案。1.A.Saturday.B.Friday.C.Sunday.D.Monday.2.A.Yes,theydo.B.No,theydont.C.Kategoesbybus.D.Idontknow.3.A.Yes,theywill.B.Yes,theyare.C.No,theywont.D.No,theyarent.4.A.Mabel.B.Dick.C.Tom.D.John.5.A.At7:10.B.At7:30.C.After7:00.D.Before7:00.6.A.Yes,shecan.B.No,shecant.C.Idontknow.D.Imnotsure.7.A.Yes,theywill.B.No,they… 相似文献
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Ⅰ.根据句意,从A,B,C,D中选择一个正确答案,完成下列反意疑问句。1.Letsmeetatthestation,?A.willyouB.wontyouC.shallweD.shantwe2.LetusgototheSummerPalacethisafternoon,?A.willyouB.wontyouC.shallweD.shantwe3.Youhadyourlunchatschool,?A.hadyouB.hadntyouC.didyouD.didntyou4.Katehastoworkharderfromnowon,?A.hasshetoB.hasntsheC.doessheD.doesntshe5.Youseldomgotothemovies,?A.doyouB.dontyouC.willyouD.wontyou6.Fewpeoplewenttomeethimyesterday,?A.didthe… 相似文献
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潘永全 《中学英语园地(高三版)》2002,(11)
听力部分(20分)Ⅰ.情景反应(5分)根据你所听到的句子,从A,B,C,D中选出正确的答语。1.A.Yes,itis.B.Yes,itdoes.C.Yes,ithas.D.Yes,itwas.2.A.Heusesitfordrinkingwine.B.Heusesthemfordrinkingwine.C.Itisusedfordrinkingwine.D.Theyareusedfordrinkingwine.3.A.38,000kilometresaway.B.380,000kilometresaway.C.30,000kilometresaway.D.300,000kilometresaway.4.A.Oh,good.B.Illuseit.C.Illbuyit.D.Letmetry.5.A.Aweeklater.B.Fort… 相似文献
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扬帆 《中学英语园地(高三版)》2003,(Z2)
MrJohnsonwashavingtroublewithhisstomach,sohewenttoseeadoctor.Thedoctorexaminedhisstomachcarefully,buthecouldntfindanyproblem.Thenhesaid,“Well,MrJohnson,takeiteasy.Theresnothingserious.Stopsmokingandthenyoullbeallrightverysoon.”“Butdoctor,”answeredMrJohnson,“Ineversmoked.Idontlikesmokingatall.”“Oh,Isee,”saidthedoctor.“Thenstopdrinkingalcoholfromnowon.”“ButIdontlikeaclohol,”answeredMrJohnson.“Dontdrinkanyteaorcoffee,then,”thedoctorsaidtohim.“Idontdri… 相似文献
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广东、广西常见鸟类的疟原虫初步调查 总被引:1,自引:0,他引:1
自1995年5月至1996年8月先后对广东、广西部分地区的常见鸟类的疟原虫进行了初步的调查,共检获鸟类26种,共367只.发现疟原虫6种,分别是三趾鹑疟原虫(P.(H).turnixsp.nov.),广西疟原虫(P.(N.)guangxiensesp.nov.),似联核疟原虫(P.(N.)parajuxtanucleare),残疟原虫(P.(H.)relictum),沃氏疟原虫(P.(N.)vaughani),还有一疟原虫为待定种(Plasmodiumsp.)对它们的红内期形态及红外期的寄生部位进行了研究.黄脚三趾鹑为国内外首次发现有疟原虫寄生,残疟原虫、沃氏疟原虫为广西新记录. 相似文献
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目的:建立用高效液相色谱法同时测定果脯佛手中甘草苷和甘草酸含量的方法.方法:采用LiChmspher RP—C18色谱柱,以乙腈-水(1.2%甲酸)为流动相,梯度洗脱,检测波长254nm.结果:甘草苷在0.21-3.15μg范围内呈良好的线性关系,回归方程为Y=1053.9644X-0.0528(r=0.9999),平均回收率为99.7%,RSD为1.72%(n=9),重复性RSD为0.14%;甘草酸铵在0.25—6.25μg范围内呈良好的线性关系,回归方程为Y=1311.3875X-14.3144(r=0.9998),平均回收率为100.8%,RSD为1.31%(n=9),重复性RSD为0.40%.结论:方法操作简便,结果可靠,重现性好. 相似文献
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Ⅰ.单项选择1.ChinaisfamoustheGreatWallandalsooneofthelargestcountrieswiththelargestpopulation.A.as,forB.for,likeC.with,asD.for,as2.oftheplayersinthisteamfromShanghai.A.Twothird,isB.Twothirds,areC.Twothree,isD.Twothrees,are3.Theage 相似文献
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郭婧 《中学英语园地(高三版)》2003,(2)
“Iloveyou,China!Iloveyou,China...”EverytimewhenIhearthesong,Ifeelveryexcited.Thesongmakesmethinkofmanythings.Chinaisthethirdlargestcountryintheworld,covering9,600,000squarekilometers.Therearemanyriversandmountainsinherterri-tory.Herpopulationisover1,200,000,000,thelargestintheworld.Shehas56nationalities.Theyarealllikebrothersandsisters.Theyliveinthebigfamilyhappily.Shehasalonghistoryofmorethan5,000years.Manynationalheroesandleadersliveinou… 相似文献
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Oneevening,Isatoutsideourhouse,lookingupatthestarrysky.Icouldnthelpthinkingofoneofmybestfriends.Lastsummer,Igotseriouslyhurtinacaraccident.Iwassenttoahospital.WhenIwokeup,Ifoundmyselflyingonasickbedwithmyparentsandanursestandingbesideme.Itriedtositup,butsuddenlyIfoundIhadlostoneofmyfeet.Isankintodespairandbegantocry.Myparentsdidwhattheycouldtocomfortme,butIkeptoncrying.Inthefollowingdays,Ididnothingbutliveonthebed,fixingmyeyesontheceiling.Ifeltentirelyhopeless.Butoneday… 相似文献
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HaveyoueverusedawalkmantolearnEnglish?Ifyouhave,pleasekeepitup.Ifyouhavent,Isuggestyoubuyoneandstarttouseitatonce.MywalkmanhasgivenmealotofhelpinEnglishstudy.Asweknow,earlymorningisthebesttimeofday.SoeverymorningIturnonmywalkmanandlistentoEnglishwords,drillsandtexts.Oneyearhaspassed.IvegotusedtolisteningtoEnglishinthemorning.AndIlikespeakingEnglishwhilelistening,whichhelpsmere-citetextsandnowIcandoiteasilyandquickly.Intheevening,afterfinishingotherhomework,Iturnonmywalk… 相似文献
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杨凤林 《中学英语园地(高三版)》2003,(Z2)
JackandBillyarebothsevenyearsold.Onedaytheywentouttosellpies(馅饼)together.Beforetheysetout,JacksmothertoldJack,“Youtaketwelvepies,andsellthemforfivecentseach.Youmustnteatthem,andyoumustntgiveanyofthemtoyourfriends.”BillysmothertoldBillythesamething.Thentheywentdowntownto-gether.Afterawholemorning,Billysoldonlyonepie.Billyfeltveryhungry,butheknewhecouldnteathispies.Whatshouldhedo?Hethoughtforamoment,thenhehadanidea.HetookhisfivecentsandboughtapiefromJackandateit.Ja… 相似文献
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Nowadayssomeyoungpeopleareputtingonweightastheyliketohavemilk,cream,fatmeat,cakes,sweetsandsoftdrinks.Thesekindsoffoodusuallycontainmuchfatandsugar.Sinceobesity(肥胖病)doesharmtopeopleshealthandthebeautyoftheirfigures,manypeople,includingme,wantverymuchtoloseweight.Oneofmyfriendstoldmethattoeatlesscouldhelpreducefat.Ibelievedherandbeganmyplantoloseweight.Igotupearlierthanusual.Forbreakfast,Ijustateapieceofbread,anddranktwoglassesofwater.ThoughIwantedverymuchtoeatsomething,… 相似文献
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WhenIwasborn,myfamilywasverypoor.Myfatherwasateacher,andmymotherwasafactoryworker.Wedidnthavemuchmoney,butwewereveryhappyatthattime,forwehadmuchtimetostaytogether.Howtimeflies!Im16thisyear.IntwoyearsIlltakepartintheuniversityentranceexamination.SoImterriblybusyeveryday.Myfatherisnowheadmasterofamiddleschool.Atnoon,myparentsusuallydontcomehomeforlunch.Myfatherevenoftengetshomeafter12oclockatnight,bywhichtimeIhavealreadyfallenasleep.Inthemorning,Ihavetogotoschoolat6:… 相似文献
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《作文大王》2003,(6)
Lifeisagame.Likeagamethereareplayersandrules.Therearewinnersandlosers.Itisuptoyoutodecidehowitisplayed.Manyhighpointsandlowpointsexist.Makethebestoutofthosepoints.Foroncetheypass,theywillnevercomebackagain.Therewillcomeatime.Whenyoulookintothemirror,Andallthatyouseeisyourself.Atthatverymoment,Youwillrealizethat’sallthatyouareandallthatouwillneverbe.Oneeitherstopslookingatmirrors,oryouexceptit.It’snoone’sfaultbutyourownforwhatyouhaveecome.Youonlyliveonce,makethebestoutof… 相似文献
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杨俊杰 《中学英语园地(高三版)》2003,(Z1)
1.December25isChristmas.ChristmasisaChistianholiday.ManyotherpeopleenjoyChristmas,too.4.Peoplemakeorbuygiftsandcardsfortheirfamiliesandfriends.6.Itisthetimetorememberpoorpeople,too.3.TheydecorateChristmastrees.5.PeoplesendChristmascards.7.ManypeoplebakecookiesforChristmas.9.PeoplesingChristmascarols.Theysingcarolsinthestreet,inhospitals,andinnursinghomes.11.OnChristmasEve,manypeoplegotochurch.13.FamiliesandfriendshaveChrist-maspartiesanddinners.8… 相似文献
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江天瑞 《中学英语园地(高三版)》2002,(12)
Ⅰ.情景反应(5分)根据你所听到的句子,从A,B,C,D中选出适当的答语。1.A.Bybike.B.Atschool.C.Workinafactory.D.Onfoot.2.A.Sure.Yourewelcome.B.Idloveto.ButIcant.C.Iliketogotothepark.D.No,Idontlike.3.A.Whatabouthalfpastthree?B.Sorry,Imbusy.C.Letsgo.D.Thatsallright.4.A.Thatsgreat.B.Itsapleasure.C.Sorry,sheisout.D.Annisallright.5.A.Yes,Imfine.B.Yourewelcome.C.Thanksalot.D.Allright.Ⅱ.对话理解(10分)A)听下面四段对话,根… 相似文献
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Forsuchalongtime,I’vehopedthateverystudentscanhaveaspecialchancetostandintheplatformandtryhisbesttoexplainthelessonsforotherstudentsandtheteacher.Thiskindofclassmustbemuchmoreinteresting.Tomysurprise,thedreambecomestrue.Inthisnewterm,wewillbetheteacherinourPoliticlessons.Fourorfivestudentsareinagroup.Andoneofthestudentstoexplainthelesson,onetopreparethelessonandotherstolookupsomeinformationaboutthelesson.Attheendoftheterm,wewillchoosethebestgroup,andgivesomepresentstothem.Thisk… 相似文献