In E-R models, three components are entity, relationship and ___________.
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In history of data model development, there are four major different data models named as hierarchical data model, network data model, ____________data model,and object-oriented data model.
平行可控后退注入点式(P-CRIP)煤炭地下气化系统相对于线性可控后退注入点式(L-CRIP)系统,气化效率更高,更适合于规模化生产。
多分支水平井是指一个或多个主水平井眼盘侧再侧钻出多个分支井眼,又叫羽状水平井或鱼骨井。