如图所示两端铰支理想轴心受压构件Ix/Iy≥4,其临界压力Ncr为()
A、π2EIx/(2b2)D
暂无解析
BernardBailynhasrecentlyreinterpretedtheearlyhistoryoftheUnitedStatesbyapplyingnewsocialresearchfindingsontheexperiencesofEuropeanmigrants.Inhisreinterpretation,migrationbecomestheorganizingprincipleforrewritingthehistoryofpreindustrialNorthAmerica.Hisapproachrestsonfourseparatepropositions.ThefirstoftheseassertsthatresidentsofearlymodernEnglandmovedregularlyabouttheircountryside;migratingtotheNewWorldwassimplyanaturalspillover.AlthoughatfirstthecoloniesheldlittlepositiveattractionfortheEnglishDtheywouldratherhavestayedhomeDbytheeighteenthcenturypeopleincreasinglymigratedtoAmericabecausetheyregardeditasthelandofopportunity.Secondly,Bailynholdsthat,contrarytothenotionthatusedtoflourishinAmericahistorytextbooks,therewasneveratypicalNewWorldcommunity.Forexample,theeconomicanddemographiccharacterofearlyNewEnglandtownsvariedconsiderably.Bailyn'sthirdpropositionsuggesttwogeneralpatternsprevailingamongthemanythousandsofmigrants:onegroupcameasindenturedservants,anothercametoacquireland.Surprisingly,Bailynsuggeststhatthosewhorecruitedindenturedservantswerethedrivingforcesoftransatlanticmigration.ThesecolonialentrepreneurshelpeddeterminethesocialcharacterofpeoplewhocametopreindustrialNorthAmerica.Atfirst,thousandsofunskilledlaborerswererecruited;bythe1730's,however,Americanemployersdemandedskilledartisans.Finally,Bailynarguesthatthecolonieswereahalf-civilizedhinterlandoftheEuropeanculturesystem.HeisundoubtedlycorrecttoinsistthatthecolonieswerepartofanAnglo-Americanempire.ButtodividetheempireintoEnglishcoreandcolonialperiphery,asBailyndoes,devaluestheachievementsofcolonialculture.Itistrue,asBailynclaims,thathighcultureinthecoloniesnevermatchedthatinEngland.Butwhatofseventeenth-centuryNewEngland,wherethesettlerscreatedeffectivelaws,builtadistinguisheduniversity,andpublishedbooksBailynmightrespondthatNewEnglandwasexceptional.However,theideasandinstitutionsdevelopedbyNewEnglandPuritanshadpowerfuleffectsonNorthAmericanculture.AlthoughBailyngoesontoapplyhisapproachtosomethousandsofindenturedservantswhomigratedjustpriortotherevolution,hefailstolinktheirexperiencewiththepoliticaldevelopmentoftheUnitedStates.Evidencepresentedinhisworksuggestshowwemightmakesuchaconnection.TheseindenturedservantsweretreatedasslavesfortheperiodduringwhichtheyhadsoldtheirtimetoAmericanemployers.Itisnotsurprisingthatassoonastheyservedtheirtimetheypassedupgoodwagesinthecitiesandheadedwesttoensuretheirpersonalindependencebyacquiringland.Thus,itisinthewestthatapeculiarlyAmericanpoliticalculturebegan,amongcolonistswhoweresuspiciousofauthorityandintenselyanti-aristocratic.
1.WhichofthefollowingstatementsaboutmigrantstocolonialNorthAmericaissupportedbyinformationinthetext
[A]AlargerpercentageofmigrantstocolonialNorthAmericacameasindenturedservantsthanasfreeagentsinterestedinacquiringland.
[B]Migrantswhocametothecoloniesasindenturedservantsweremoresuccessfulatmakingalivelihoodthanwerefarmersandartisans.
[C]MigrantstocolonialNorthAmericaweremoresuccessfulatacquiringtheirownlandduringtheeighteenthcenturythanduringtheseventeenthcentury.
[D]Bythe1730's,migrantsalreadyskilledinatradewereinmoredemandbyAmericanemployersthanwereunskilledlaborers.
2.TheauthorofthetextstatesthatBailynfailedto
[A]GivesufficientemphasistotheculturalandpoliticalinterdependenceofthecoloniesandEngland.
[B]DescribecarefullyhowmigrantsofdifferentethnicbackgroundspreservedtheircultureintheUnitedStates.
[C]TakeadvantageofsocialresearchontheexperiencesofcolonistswhomigratedtocolonialNorthAmericaspecificallytoacquireland.
[D]RelatetheexperienceofthemigrantstothepoliticalvaluesthateventuallyshapedthecharacteroftheUnitedStates.
3.Whichofthefollowingbestsummarizestheauthor'sevaluationofBailyn'sfourthproposition
[A]Itistotallyimplausible.
[B]Itispartiallyacceptable.
[C]Itishighlyadmirable.
[D]Itiscontroversialthoughpersuasive.
4.Accordingtothetext,BailynandtheauthoragreeonwhichofthefollowingstatementsaboutthecultureofcolonialNewEngland
[A]HighcultureinNewEnglandneverequaledthehighcultureofEngland.
[B]TheculturalachievementsofcolonialNewEnglandhavegenerallybeenunrecognizedbyhistorians.
[C]ThecolonistsimitatedthehighcultureofEngland,anddidnotdevelopaculturethatwasuniquelytheirown.
[D]ThesoutherncoloniesweregreatlyinfluencedbythehighcultureofNewEngland.
5.TheauthorofthetextwouldbemostlikelytoagreewithwhichofthefollowingstatementsaboutBailyn'swork
[A]BailynunderestimatestheeffectsofPuritanthoughtonNorthAmericanculture.
[B]BailynoveremphasizestheeconomicdependenceofthecoloniesonGreatBritain.
[C]Bailyn'sdescriptionofthecoloniesaspartofanAnglo-Americanempireismisleadingandincorrect.
[D]BailynfailedtotesthispropositionsonaspecificgroupofmigrantstocolonialNorthAmerica.
汉译英:现代社会无论价值观的持有还是生活方式的选择都充满了矛盾。而最让现代人感到尴尬的是,面对重重矛盾,许多时候你别无
选择。匆忙与休闲是截然不同的两种生活方式。但在现实生活中,人们却在这两种生活方式间频繁穿梭,有时也说不清自己到底是―休闲
着‖还是―忙碌着‖。譬如说,当我们正在旅游胜地享受假期,却忽然接到老板的电话,告知我们客户或工作方面出了麻烦——现代便捷先进工具在此刻显示出了它狰狞、阴郁的面容——搞得人一下子兴趣全无。接下来的休闲只能徒有其表,因为心里已是火烧火燎了。
Whodoyousupposeistheman____ourteacheristalking?
LastFridayIsawsomeboys______behindDaniel,_____thecomputergames.
Itisnecessarythatthestudents____moreexcercisestodo.