帮助用户实现对数据库的访问、操作及安全控制，并提供数据库与用户或用户与应用程序之间接口的一组程序称为（）
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翻译：Sineethepremiumvarieswiththescopeofinsuranee,extrapremiumisforbuyer'saeeount,shouldadditionalrisksbecovered.
Accordingtothe"principles-and-parameters"theory,"principles"refertohighlyabstractpropertiesofgrammarwhichareappliedtolanguageingeneralandwhichgeneratephrasesandatthesametimerestrainthepowerofMovea,while"parameters"allowgeneralprinciplestooperateincertainrestrictedways,accordingtowhichparticulargrammarsofnaturallanguagesvary.
ThechildhoodofTomSawyerandHuckFinnintheMississippiisarecordofavanishedwayoflifeinthe()Mississippivalley
ItwashismasterpieceTheGreatGatsbythatmade()oneofthegreatestAmericannovelists.
Thereisalwaysareadymarket____SewingMachines,providedtheyare___goodqualityandcompetitiveinprice.