At present, there is still a great deal of problem in the application of the secure model of the distributed database. under common circumstance, the secure usually is self - contradict with vivid in the database, while customer wanting to get stronger and vivid capability, needing the sacrifice to the database secure in some extent, vice versa. based on distributed database system and secure characteristic, this text analyzed its database safe strategy and related secure model, the system appearance and operate rule, the system appearance and operate rule, studied the customer role management, safe strategy and the role authorition problem, specially emphatically studied the bell. lapadula model. ( including its basic concept, system appearance, related operation and the secure rule gather ). according to the actual application environment, this text carried bell. lapadula model to entity to turn, through a research discover that model adoption compulsory secure strategy, attain a vivid secure control not easily, so increase the secure strategy of the independent access control mechanism to carry on " flabby " to the original model, and relatedly increased rule, put forward a new kind of secure mechanism - ddm ( the distributed database discretionary mandatory ). turn the rule principle according to the ddm secure mechanism and entity, designed a secure controller of database - dds ( the distributed database secure distribute ) controller adopted ddm secure mechanism, and established the secure control mechanism of the dds secure controller
拉帕丟
拉模型進行實體化，通過研究發現該模型採用強制性安全策略，不易做到靈活的安全控制，因此添加自主存取控制機制的安全策略對原模型進行「鬆弛」 ，並相應的增加了規則，提出一種新的安全機制? ? ddm （ distributeddatabasediscretionaryandmandatory ，分散式數據
庫自主與強制性）安全機制。基於實體化規則原理，設計了一個採用ddm安全機制的數據
庫控制器? ? dds （ distributeddatabasesecure ，分散式數據
庫安全）控制器，並設置了dds安全控制器的安全控制機制。通過dds安全控制器在實踐中的應用，本文分析了dds安全控制器的各項功能和安全特點，設計了實際應用中dds控制器的管理方案，實現了分散式數據
庫安全控制。
All the doorways of the big hall were suddenly filled with the smiling faces of the house - serfsmen on one side, and women on the othercome to look at their master making merry. our little father ! an eagle he is ! the old nurse said out loud at one door
一當聽見歡快的引人入勝的與快樂的特烈
帕克舞曲相似的丹尼
拉庫波爾舞曲，大廳的幾個門口驀然堆滿了家僕的笑臉，一旁是男僕，一旁是女僕，他們都出來觀看盡情作樂的老爺。
The study showed that in pagela flexure zone, south slope of pacuo sag, south slope of jiangriacuo and luomadiku zone, the exploration should focus on petroleum reservoir with self - source enclosed dynamic system for forming reservoirs, while in northern hongxingliang - di ezong and luomadiku areas, on the reservoir with middle allo - source - self - source semi - full enclosed dynamic system for forming reservoirs, and pay attention to searching for the reservoirs with upper allo - source semi - open enclosed dynamic system
在帕格拉撓曲帶、爬錯凹陷南斜坡、蔣日阿錯南斜坡及羅瑪迪庫區帶以尋找自源封閉成藏動力學系統的油氣藏為主;而在北部的紅星梁-低鄂總、羅瑪迪庫以中部它源-自源半封閉-封閉的成藏動力學系統的油氣藏為主，同時兼顧頂部它源開放-半封閉成藏動力學系統的油氣藏勘探。
