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电路的失压保护常由（）来实施。
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《社会保险法》明确了社会保险的主要功能有（）
电路交换（）会话层（）超文本传输协议（）表示层（）分组交换（）应用层（）文件传输协议（）报文交换（）电子邮件协议（）
ThenumberofspeakersofEnglishinShakespeare’stimeisestimated(估计)tohavebeenaboutfivemillion.Todayitisestimatedthatsome260millionpeoplespeakitasanativelanguage,mainlyintheUnitedStates,Canada,GreatBritain,Ireland,SouthAfrica,AustraliaandNewZealand.InadditiontothestandardvarietiesofEnglishfoundintheseareas,thereareagreatmanyregionalandsocialvarietiesofthelanguageaswellasvariouslevelsofusagethatareemployedbothinitsspokenandwrittenforms.Infact,itisimpossibletoestimatethenumberofpeopleintheworldwhohaveacquiredanadequate(足够的)workingknowledgeofEnglishinadditiontotheirownlanguages.ThepurposeforEnglishlearningandthesituationsinwhichsuchlearningtakesplacearesovariedthatitisdifficulttoexplainandstillmoredifficulttojudgewhatformsanadequateworkingknowledgeforeachsituation.ThemainreasonforthewidespreaddemandforEnglishisitspresent-dayimportanceasaworldlanguage.Besidesservingtheindefiniteneedsofitsnativespeakers,Englishisalanguageinwhichsomeofimportantworksinscience,technology,andotherfieldsarebeingproduced,andnotalwaysbynativespeakers.Itiswidelyusedforsuchpurposesasmeteorologicalandairportcommunications,internationalconferences,andthespreadofinformationovertheradioandtelevisionnetworksofmanynations.Itisalanguageofwidercommunicationforanumberofdevelopingcountries,especiallyformerBritishcolonies.Manyofthesecountrieshavemultilingualpopulationsandneedalanguageforinternalcommunicationinsuchmattersasgovernment,commerce,industry,lawandeducationaswellasforinternationalcommunicationandforentrancetothescientificandtechnologicaldevelopmentsintheWest.WhattypeofdevelopingcountrieswouldbemostlikelytouseEnglish
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