Relational Model表示（）。

● (73) is a query language for manipulating data in a relational database.

(73) A. Assemble

B. SQL

C. C++

D. Fortran

假定一个工程由一个窗体文件Form1和两个标准模块文件Model1及Model2 组成。 Model1代码如下： Public X As Integer Public Y As Integer Sub S1（ ） x=1 S2 End Sub Sub S2（ ） y=10 Form1．Show End Sub Model2的代码如下： Sub Main（ ） S1 End Sub 其中Sub Main被设置为启动过程。程序运行后，各模块的执行顺序是（ ）。

A.Form1→Model1→Model2

B.Model1→Model2→Form1

C.Model2→Model1→Form1

D.Model2→Form1→Model1

A.the bottom-up model and the top-down model

B.the bottom-up model and the interactive model

C.the bottom-up model

D.the top-down model and the interactive model

A.machineserialnumber，model，andmachinesignature

B.model，disksize，andmachineserialnumber

C.model，StorageManagerversion，andmachinesignature

D.model，WWNN，andmachineserialnumber

The relational database model requires the data be(110)through programs that don't rely on the position of the data in the database. This is in direct(111)to the other database mode, where the program has to follow a series of pointers to the data it seeks. A program(112)a relational database simply asks for the data it seeks; the DBMS performs the necessary searches and(113)the information. The(114)on how the search is done are specific to the DBMS and vary from product to product.

A．accessed

B．moved

C．read

D．wrote

存储模型伪操作,格式如下: .MODEL memory_model [,model options]。( )

（73)is a query language for manipulating data in a relational database.

A.Assemble

B.SQL

C.C++

D.Fortran

System analysis is traditionally done top-down using structured analysis based on（ ）. Object-oriented analysis focuses on creation of models. The three types of theanalysis model are（ ）. There are two substages of object-oriented analysis.（ ）focuses on real-world things whose semantics the application captures. The object constructedin the requirement analysis shows the（ ）of the real-world system and organizes it intoworkable pieces.（ ）addresses the computer aspects of the application that are visible tousers. The objects are those which can be expected to vary from time to time quite rapidly.

A.functional decomposition B.object abstraction C.data inheritance D.information generalization A.function model，class model and state model B.class model，interaction model and state model C.class model，interaction model and sequence model D.function model，interaction model and state model A.Static analysis B.Semantic analysis C.Scope analysis D.Domain analysis A.static structure B.system components C.data flows D.program procedures A.Program analysis B.Function requirement C.Application analysis D.Physical model

（73） is a query language for manipulating data in a relational database.

A.Assemble

B.SQL

C.C++

D.Fortran

A.all tuples in a relation must be distinct(独一无二的)

B.every relation has a key(键)

C.all of the above

D.for any two tuples,the values associated with one or more of thei rattributes(属性)must differ