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1、初中英语填空题专练1Yesterdaymorning,LiHuagotupearlyand____1____breakfasthewenttoschool._____2_____hiswaytoschoolhesawsome____3____comingfromthe____4___ofahouse.“Theremustbesomethingon____5_____,”hethought.Thenhe___6____asfastashecouldtogetsomewater,afterashorttime,hecarriedabucketof___
2、7____.Quicklyhepouredthewaterintothefire.Thesmokewasput___8_____.Tohissurprise,hesawanold____9____outofthewindow,withasmokeinhishand.HeshoutedatLiHua___10______,“Seewhatyouaredoing!Youbadboy!”1_________ 2_____________3_____________ 4____________ 5_____________6_________ 7_____
3、________8_____________ 9____________ 10_____________2Moreandmorepeopleare___1_____thelifewithcomputers.UsingcomputersyoucansendE-mail____2___andeasily.Youareabletosendaletterwithpicturesandsoundstosomeone___3____intheworldwithoutputtingastamp.E-mailcansenditsmessagetotheothers
4、ideoftheworld____4_____seconds.E-mailiseasytouseandtheseconddeterminationasaresult.ResultsoftwosmallThenumber.5,allowstheanalysisofpersonnelsimultaneouslyorinquicksuccessionfortheseconddetermination,theabsolutevalueofthedifferenceoftheresults:whentheashislessthan1%,shouldnotex
5、ceed0.02%oftheaverageresultswhentheashismorethan1%,shouldnotexceed2%oftheaverageresult.Proteinfromstarch-determinationofKjeldahlnitrogen-1,definethecontent:formedbyhydrolysisofstarchanditsderivativesinthesampleoffreeaminoacidcontentofnitrogenandammonia-containingcompounds.Toth
6、esamplensamplesoftheoriginalweightweightweightexpressedasapercentage.Principle2,inthepresenceofacatalyst,sulfuricacidstarchanditsderivativesandreactionproductsofalkali,anddistillingammoniarelease.Usingboricacidsolutioncollects,andthencalibratedsulfuricacidsolutiontitrated,gett
7、hevolumeofsulphuricacidconsumedthenumberthatcanbeconvertedintonitrogen.Thismethodissuitableforammoniacontentisgreaterthan0.01%(m/m)samplesofstarchanditsderivatives;3,reagentinthedeterminationprocess,onlyuseanalyticalgradereagentanddistilledwater,oratleastthepurityofwater.Conce
8、ntratedsulphuricacid:96%(m/m),ρ20for1.84g/mL.Sodiumhydroxides
