At the same time, we propose a representative data model, i . e . gt data model, and its query language . theoretically, we deeply study the temporal relational algebra and sql-like language based on our ter model, laying a solid theoretic foundation for our accelerator rjf cavity design system 因此,論文提出了一個(gè)概念性數(shù)據(jù)模型,即時(shí)態(tài)實(shí)體一關(guān)系數(shù)據(jù)模型(ter模型廠提出了一個(gè)表示性數(shù)扼模型,即gt數(shù)據(jù)模型及其查詢(xún)語(yǔ)言。