为了指导计算机网络的互联、互通和互操作， ISO颁布了 OSI参 考模型，其基本结构分为 ( )
A、6层C
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Thedevastatingfloodsanddroughtsthatimposedarecurrenttaxofsufferingonthefarmersnolongeroccur.Egyptianagriculturehasbeentransformed,andindustryisbenefitingfrompowergeneratedbythedam.（）
Duringthepasttwodecades,researchhas________ourknowledgeofdaydreaming.
英语翻译：telecommunications
AlthoughTomissatisfiedwithhisacademicachievement，hewonders_______willhappentohisfamilylife.
InCanadathefederalgovernmentshavealwaysbeenformedby________.
