【单选题】层次模型、网状模型和关系模型的划分根据是( )。
【简答题】层次模型、网状模型和关系模型等三种基本数据模型是根据什么来划分的?
【简答题】结构酶(structural enzyme)
【单选题】层次模型、网状模型和关系模型的划分根据是( )
【单选题】层次模型、网状模型和关系模型的划分根据是()
【简答题】结构基因(structural gene)
【单选题】Which statement correctly describes structural unemployment?
A.
Structural unemployment occurs mainly during recessions.
B.
Structural unemployment is also called frictional unemployment.
C.
Structural unemployment occurs even when the economy is at the natural unemployment rate.
D.
The amount of structural unemployment depends on normal labor turnover.
【简答题】结构域(structural domain)
【简答题】结构论(Structural Approach)