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I'd like to ______ a special seat for the concert of May 5th.
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英语《单项选择》真题及答案
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有关系SCS-IDC-IDAGESCORE查找成绩大于60分的学生的学号和成绩用如下的关系代数表达式
只有Ⅰ正确
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设关系SCs_idc_idcourse_namescore其函数依赖集F为F={s_idc_id→s
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任务型阅读ChildreninAmericalikeHalloween万圣节verymuch.Int
有关系SCS-IDC-IDAGESCORE查找年龄大于22岁的学生的学号和分数用如下的关系代数表达式
只有Ⅰ正确
只有Ⅲ正确
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AlanisinClassTwoGradeSeven.Heisl2.HisEnglishteache
AlanisinClassTwoGradeSeven.Heis12.HisEnglishteache
在SQLServer的查询语句中若查询表记录中所有em_id列满足前两个字符为11的纪录则下列正确W
Where em_id=‘11%’
Where em_id AS ‘11%’
Where em_id like ‘11%’
Where em_id link ‘11%’
It’sSundaytoday.MyparentsandIgotoasmallrestaurantf
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有关系SCS-IDC-IDAGESCORE查找成绩大于60分的学生的学号和成绩用如下的关系代数表达式
只有Ⅰ正确
Ⅰ、Ⅲ正确
Ⅰ、Ⅱ正确
都正确
WhatNormalFormisthestudenttableshownstudenttables_
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KidswithSpecialNeedsKidswithspecialneedsrefertoany
有关系SCS-IDC-IDAGESCORE查找年龄大于22岁的学生的学号和分数用如下的关系代数表达式
只有Ⅰ正确
只有Ⅲ正确
Ⅰ、Ⅲ正确
Ⅰ、Ⅲ正确
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Shopperswhocarefullyplantheirvisittothegrocerystorecansavemoneyontheirgrocerybills.Shoppingwhennot61stickingtotheirgrocerylistand62afewsimpleruleswillcutdownthegrocerybill. Shoppersshouldvisitthegrocerystoreonafullstomachbyplanningtheirtrip63afteralargemeal.Ifthat’snot64theyshouldfindsomething65toeatonwhilepreparingagrocerylist.Mostshoppersarelesslikelytobuyextraswhentheyarenottroubledby66. Althoughhavingalistand67toitisthemostimportantfactorinsavingmoney68mustpreparelistswiselyinorderto69.Acarefullyplannedlistshould70inseasonproduceandanyitemson71ordiscountedthroughcoupons.Manyspecialbuysareannouncedthroughthelocalnewspaperssobuyingthe"groceryissue"is72themoneyyouspend.73it’simportanttorememberthatmanynewermoreexpensiveproductsfirstofferedthroughcouponsmaynot74enoughsavingsforshopperstogiveupproductstheyusuallybuy. Nowthattheshopperhas75thegrocerylistit’stimetoleaveforthestore.Howevernopreparationsarecompletewithoutapocketcalculatororapieceofpaperanda76tofigurecosts. Onceatthestoretheshopperwhowantstosavemoneyshouldfollowafewmorerules.Theshoppershouldnotstay77thannecessarybecausebillsgoupeachminutetheshopperisinthestore.So78atimelimitandacostlimitcanholddownthe79.Ofcoursetheshoppershouldstickstrictlytothe80andnotbuyanyextras.Ifthegrocerylistisashortoneshopperscanusethesmallhand-heldbasketinsteadoftheroomygrocerycart. 76
Shopperswhocarefullyplantheirvisittothegrocerystorecansavemoneyontheirgrocerybills.Shoppingwhennot61stickingtotheirgrocerylistand62afewsimpleruleswillcutdownthegrocerybill. Shoppersshouldvisitthegrocerystoreonafullstomachbyplanningtheirtrip63afteralargemeal.Ifthat’snot64theyshouldfindsomething65toeatonwhilepreparingagrocerylist.Mostshoppersarelesslikelytobuyextraswhentheyarenottroubledby66. Althoughhavingalistand67toitisthemostimportantfactorinsavingmoney68mustpreparelistswiselyinorderto69.Acarefullyplannedlistshould70inseasonproduceandanyitemson71ordiscountedthroughcoupons.Manyspecialbuysareannouncedthroughthelocalnewspaperssobuyingthe"groceryissue"is72themoneyyouspend.73it’simportanttorememberthatmanynewermoreexpensiveproductsfirstofferedthroughcouponsmaynot74enoughsavingsforshopperstogiveupproductstheyusuallybuy. Nowthattheshopperhas75thegrocerylistit’stimetoleaveforthestore.Howevernopreparationsarecompletewithoutapocketcalculatororapieceofpaperanda76tofigurecosts. Onceatthestoretheshopperwhowantstosavemoneyshouldfollowafewmorerules.Theshoppershouldnotstay77thannecessarybecausebillsgoupeachminutetheshopperisinthestore.So78atimelimitandacostlimitcanholddownthe79.Ofcoursetheshoppershouldstickstrictlytothe80andnotbuyanyextras.Ifthegrocerylistisashortoneshopperscanusethesmallhand-heldbasketinsteadoftheroomygrocerycart. 68
Shopperswhocarefullyplantheirvisittothegrocerystorecansavemoneyontheirgrocerybills.Shoppingwhennot61stickingtotheirgrocerylistand62afewsimpleruleswillcutdownthegrocerybill. Shoppersshouldvisitthegrocerystoreonafullstomachbyplanningtheirtrip63afteralargemeal.Ifthat’snot64theyshouldfindsomething65toeatonwhilepreparingagrocerylist.Mostshoppersarelesslikelytobuyextraswhentheyarenottroubledby66. Althoughhavingalistand67toitisthemostimportantfactorinsavingmoney68mustpreparelistswiselyinorderto69.Acarefullyplannedlistshould70inseasonproduceandanyitemson71ordiscountedthroughcoupons.Manyspecialbuysareannouncedthroughthelocalnewspaperssobuyingthe"groceryissue"is72themoneyyouspend.73it’simportanttorememberthatmanynewermoreexpensiveproductsfirstofferedthroughcouponsmaynot74enoughsavingsforshopperstogiveupproductstheyusuallybuy. Nowthattheshopperhas75thegrocerylistit’stimetoleaveforthestore.Howevernopreparationsarecompletewithoutapocketcalculatororapieceofpaperanda76tofigurecosts. Onceatthestoretheshopperwhowantstosavemoneyshouldfollowafewmorerules.Theshoppershouldnotstay77thannecessarybecausebillsgoupeachminutetheshopperisinthestore.So78atimelimitandacostlimitcanholddownthe79.Ofcoursetheshoppershouldstickstrictlytothe80andnotbuyanyextras.Ifthegrocerylistisashortoneshopperscanusethesmallhand-heldbasketinsteadoftheroomygrocerycart. 78
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Shopperswhocarefullyplantheirvisittothegrocerystorecansavemoneyontheirgrocerybills.Shoppingwhennot61stickingtotheirgrocerylistand62afewsimpleruleswillcutdownthegrocerybill. Shoppersshouldvisitthegrocerystoreonafullstomachbyplanningtheirtrip63afteralargemeal.Ifthat’snot64theyshouldfindsomething65toeatonwhilepreparingagrocerylist.Mostshoppersarelesslikelytobuyextraswhentheyarenottroubledby66. Althoughhavingalistand67toitisthemostimportantfactorinsavingmoney68mustpreparelistswiselyinorderto69.Acarefullyplannedlistshould70inseasonproduceandanyitemson71ordiscountedthroughcoupons.Manyspecialbuysareannouncedthroughthelocalnewspaperssobuyingthe"groceryissue"is72themoneyyouspend.73it’simportanttorememberthatmanynewermoreexpensiveproductsfirstofferedthroughcouponsmaynot74enoughsavingsforshopperstogiveupproductstheyusuallybuy. Nowthattheshopperhas75thegrocerylistit’stimetoleaveforthestore.Howevernopreparationsarecompletewithoutapocketcalculatororapieceofpaperanda76tofigurecosts. Onceatthestoretheshopperwhowantstosavemoneyshouldfollowafewmorerules.Theshoppershouldnotstay77thannecessarybecausebillsgoupeachminutetheshopperisinthestore.So78atimelimitandacostlimitcanholddownthe79.Ofcoursetheshoppershouldstickstrictlytothe80andnotbuyanyextras.Ifthegrocerylistisashortoneshopperscanusethesmallhand-heldbasketinsteadoftheroomygrocerycart. 74
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Therearemanyreasonsofthetidalactionwhichisaverycomplicatedphenomenoninvolvingmanyfactorsallofwhichmustbeconsideredtopredicttideinanyoneplaceatanyonetime.Thealternateriseandfallofthesurfaceoftheseasandtheoceanismainlycausedbytheattractiveforceofthemoonalone.Whentheattractionisgreatthetideishigh;andconverselywhentheattractionisminimalthetideislow.Betweenthehighandthelowtideisaperiodofalittleoversixhoursbeingcalledduringitsriseafloodtideandduringitsfallanebbtide. Thesunalsoexertsitseffectonthetidebeingalitfielessthanhalfasmuchasthemoonalthoughitsmassissomuchgreater.Whenthemoonandthesunarehorizontalthehighesthightideoccursandwhentheyareverticalthelowestlowtidetakesplace. Thewindalsoplaysanimportantpartinthemodificationofthenormalriseandfallofthetide.Thusthesefactorsaffecteachothereitherdetractingoraddingtotheattractiveforcestoaddorsubtractfromtheweightofthetide.Butthetidesstillmoveinexorablyonrisingtwiceadaygettingalittlelatereachdayandposingaproblemofcorrectlypredictingtheirheightsandlows. Theprincipalideaofthisarticleis
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Crimehasitsowncyclesamagazinereportedsomeyearsago.Policerecordsthatwerestudiedforfiveyearsfromover2400citiesandtownsshowasurprisinglinkbetweenchangesintheseasonandcrimepatterns.Thepatternofcrimehasvariedverylittleoveralongperiodofyears.MurderreachesitshighduringJulyandAugustasdootherviolentattacks.Murdermoreoverismorethanseasonal:Itisaweekendcrime.Itisalsoanight-timecrime:62percentofmurdersaredonebetween6p.m.and6a.m.. Unlikethesummerhighincrimesofbodilyharmrobbinghasadifferentcycle.Youaremostlikelytoberobbedbetween6p.m.and2a.m.onaSaturdaynightinDecemberJanuaryorFebruary.ThemonthwithleastcrimesofallisMay--exceptforonestrangefact.Moredogbitesarereportedinthismonththaninanyothermonthoftheyear. Obviouslyourseasonalcyclesofknowledgearecompletelydifferentfromourtendenciesforcrimes.ProfessorHuntingtonmadeextensivestudiestodiscovertheseasonswhenpeoplereadseriousbooksattendscientificmeetingsandgethighestresultsonexaminations.Inallcaseshefoundaseparatedhighandautumnhighseparatedbyasummerlow. Possiblyhightemperatureandhighhumiditycauseourstrangeandviolentsummeractionsbutpoliceofficialsarenotsure."Thereisofcoursenoproofofaconnectionbetweenhumidityandmurder"theysay"Whymurder’shightimeshouldcomeinthesummertimewereallydonotknow." Agoodtitleofthepassagewouldbe
You本来应该finishedthistaskabitearlier.
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Anumberofpersonshaveexpressedconcernaboutpossiblehealthdangerstoworkerswhousedevicescalledvideo-displayterminals终端orVDTs.Thesearethedevicesusedtoshowcomputerinformation.SomereportslinkVDTstohealthdisordersincludingeyeproblemsandmuscleproblems.Eventhehealthofthepregnantwomenandtheirunbornbabiesissaidtobeendangered.Video-displayterminalsproducelowlevelsoftheelectromagneticradiation电磁辐射.ExpertssaymostmodernVDTshavebeendesignedtolimitthedangersfromsuchradiation.Howeverstudyshowsthatevenlowlevelsofelectromagneticradiationscanaffectthegrowthofthecells.AsaresultsomedoctorsadvisewomentostopworkingwithVDTswhiletheyarepregnant.OnestudyfoundwomenwhoworkwithVDTsinearlypregnancyaremorelikelythanotherstohavetheirpregnancyendunexpectedly.ResearcherssaidthatthisdoesnotnecessarilymeanthatVDTsthemselvescauseproblems.Someexpertssaidthefindingsshowworkingconditionsnotthemachinescausetheproblems.Lawmakersinm6rethanAmericanstateshaveproposedbillstocontrolworkingconditionsforVDToperators. Whichofthefollowingstatementisfalse
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Therearemanyreasonsofthetidalactionwhichisaverycomplicatedphenomenoninvolvingmanyfactorsallofwhichmustbeconsideredtopredicttideinanyoneplaceatanyonetime.Thealternateriseandfallofthesurfaceoftheseasandtheoceanismainlycausedbytheattractiveforceofthemoonalone.Whentheattractionisgreatthetideishigh;andconverselywhentheattractionisminimalthetideislow.Betweenthehighandthelowtideisaperiodofalittleoversixhoursbeingcalledduringitsriseafloodtideandduringitsfallanebbtide. Thesunalsoexertsitseffectonthetidebeingalitfielessthanhalfasmuchasthemoonalthoughitsmassissomuchgreater.Whenthemoonandthesunarehorizontalthehighesthightideoccursandwhentheyareverticalthelowestlowtidetakesplace. Thewindalsoplaysanimportantpartinthemodificationofthenormalriseandfallofthetide.Thusthesefactorsaffecteachothereitherdetractingoraddingtotheattractiveforcestoaddorsubtractfromtheweightofthetide.Butthetidesstillmoveinexorablyonrisingtwiceadaygettingalittlelatereachdayandposingaproblemofcorrectlypredictingtheirheightsandlows. Itcanbeconcludedfromthisarticlethattheattractionofthesunis
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Shopperswhocarefullyplantheirvisittothegrocerystorecansavemoneyontheirgrocerybills.Shoppingwhennot61stickingtotheirgrocerylistand62afewsimpleruleswillcutdownthegrocerybill. Shoppersshouldvisitthegrocerystoreonafullstomachbyplanningtheirtrip63afteralargemeal.Ifthat’snot64theyshouldfindsomething65toeatonwhilepreparingagrocerylist.Mostshoppersarelesslikelytobuyextraswhentheyarenottroubledby66. Althoughhavingalistand67toitisthemostimportantfactorinsavingmoney68mustpreparelistswiselyinorderto69.Acarefullyplannedlistshould70inseasonproduceandanyitemson71ordiscountedthroughcoupons.Manyspecialbuysareannouncedthroughthelocalnewspaperssobuyingthe"groceryissue"is72themoneyyouspend.73it’simportanttorememberthatmanynewermoreexpensiveproductsfirstofferedthroughcouponsmaynot74enoughsavingsforshopperstogiveupproductstheyusuallybuy. Nowthattheshopperhas75thegrocerylistit’stimetoleaveforthestore.Howevernopreparationsarecompletewithoutapocketcalculatororapieceofpaperanda76tofigurecosts. Onceatthestoretheshopperwhowantstosavemoneyshouldfollowafewmorerules.Theshoppershouldnotstay77thannecessarybecausebillsgoupeachminutetheshopperisinthestore.So78atimelimitandacostlimitcanholddownthe79.Ofcoursetheshoppershouldstickstrictlytothe80andnotbuyanyextras.Ifthegrocerylistisashortoneshopperscanusethesmallhand-heldbasketinsteadoftheroomygrocerycart. 72
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Shopperswhocarefullyplantheirvisittothegrocerystorecansavemoneyontheirgrocerybills.Shoppingwhennot61stickingtotheirgrocerylistand62afewsimpleruleswillcutdownthegrocerybill. Shoppersshouldvisitthegrocerystoreonafullstomachbyplanningtheirtrip63afteralargemeal.Ifthat’snot64theyshouldfindsomething65toeatonwhilepreparingagrocerylist.Mostshoppersarelesslikelytobuyextraswhentheyarenottroubledby66. Althoughhavingalistand67toitisthemostimportantfactorinsavingmoney68mustpreparelistswiselyinorderto69.Acarefullyplannedlistshould70inseasonproduceandanyitemson71ordiscountedthroughcoupons.Manyspecialbuysareannouncedthroughthelocalnewspaperssobuyingthe"groceryissue"is72themoneyyouspend.73it’simportanttorememberthatmanynewermoreexpensiveproductsfirstofferedthroughcouponsmaynot74enoughsavingsforshopperstogiveupproductstheyusuallybuy. Nowthattheshopperhas75thegrocerylistit’stimetoleaveforthestore.Howevernopreparationsarecompletewithoutapocketcalculatororapieceofpaperanda76tofigurecosts. Onceatthestoretheshopperwhowantstosavemoneyshouldfollowafewmorerules.Theshoppershouldnotstay77thannecessarybecausebillsgoupeachminutetheshopperisinthestore.So78atimelimitandacostlimitcanholddownthe79.Ofcoursetheshoppershouldstickstrictlytothe80andnotbuyanyextras.Ifthegrocerylistisashortoneshopperscanusethesmallhand-heldbasketinsteadoftheroomygrocerycart. 80
Anumberofpersonshaveexpressedconcernaboutpossiblehealthdangerstoworkerswhousedevicescalledvideo-displayterminals终端orVDTs.Thesearethedevicesusedtoshowcomputerinformation.SomereportslinkVDTstohealthdisordersincludingeyeproblemsandmuscleproblems.Eventhehealthofthepregnantwomenandtheirunbornbabiesissaidtobeendangered.Video-displayterminalsproducelowlevelsoftheelectromagneticradiation电磁辐射.ExpertssaymostmodernVDTshavebeendesignedtolimitthedangersfromsuchradiation.Howeverstudyshowsthatevenlowlevelsofelectromagneticradiationscanaffectthegrowthofthecells.AsaresultsomedoctorsadvisewomentostopworkingwithVDTswhiletheyarepregnant.OnestudyfoundwomenwhoworkwithVDTsinearlypregnancyaremorelikelythanotherstohavetheirpregnancyendunexpectedly.ResearcherssaidthatthisdoesnotnecessarilymeanthatVDTsthemselvescauseproblems.Someexpertssaidthefindingsshowworkingconditionsnotthemachinescausetheproblems.Lawmakersinm6rethanAmericanstateshaveproposedbillstocontrolworkingconditionsforVDToperators. AccordingtothepassageweknowmostmodernVDTs
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