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表示程序模块之间数据传递关系的图称为数据流图。 A diagram representing the data transfer relationship between program modules is called a data flow graph.
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更多 “表示程序模块之间数据传递关系的图称为数据流图。 A diagram representing the data transfer relationship between program modules is called a data flow graph.” 相关考题
考题
● 在UML的动态建模机制中， （34） 描述了对象之间动态的交互关系，还描述了交互的对象之间的静态链接关系，即同时反映系统的动态和静态特征。（34）A. 状态图（State Diagram）B. 序列图（Sequence Diagram）C. 协作图（Collaboration Diagram）D. 活动图（Activity Diagram）
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● One tool that is useful during both analysis and design is the （72） ,which is a pictorial representation of the items of information(entities) within the system and the relationships between these pieces of information.（72）A．data dictionaryB．dataflow diagramC．use case diagramD．entity-relationship diagram
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One tool that is useful during both analysis and design is the ______，which is a pictorial representation of the items of infonnation(entities)within the system and the relationships between these pieces of information．A．data dictionaryB．dataflow diagramC．use case diagramD．entity-relationship diagram
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● The program and the data are kept inside the computer in a place called(73) .(73)A. busB. cacheC. CPUD. memory
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()能够充分地说明低层模块内部的处理细节和各模块之间数据传递的关系。
A.HIPO图()B.IPOC图(输入加工输出(INPUTPROCESSOUTPUT)图的简称)C.数据流程图D.数据字典
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In the open systems interconnection (OSI) reference model, "layer" means one of seven conceptually complete,(71) arranged groups of services, functions, and protocols, that extend across all open systems.Application layer provides means for the application(72) to access the OSI environment. Presentation layer provides for the selection of a common syntax for representing data.(73) layer provides the means necessary for cooperating presentation entities to organize and synchronize their dialog and to manage their data exchange. Transport layer provides a reliable end-to-end data transfer service. Network layer provides for the entities in the transport layer the means for transferring blocks of data, by(74) and switching through the network between the open systems in which those entities reside. Data link layer provides services to transfer data between network layer entities. Physical layer provides the mechanical, electrical, functional, and procedural means to establish, maintain and(75) physical connections for transfer of bits over a transmission medium.A．ranklyB．levellyC．layeredD．hierarchically
考题
数据流程图（Data Flow Diagram， DFD/Data Flow Chart）是描述系统数据流程的工具。它将数据独立抽象出来，通过图形方式描述信息的来龙去脉和实际流程。在数据流程图中用（）表示处理过程。A.长方形B.带圆角的长方形C.正方形D.圆或椭圆
考题
The program and the data are kept inside the computer in a place called______．A．busB．cacheC．CPUD．memory
考题
（ ）is used to model aggregates of information and the relationships these aggregates have to other.A.Data flow diagram B.Entity relationship diagram C.Sequence diagram D.Structure diagram
考题
数据流程图（Data Flow Diagram，DFD/Data Flow Chart）是描述系统数据流程的工具。它将数据独立抽象出来，通过图形方式描述信息的来龙去脉和实际流程。在数据流程图中用（ ）表示外部实体。A.长方形
B.带圆角的长方形
C.正方形
D.圆或椭圆
考题
（ ）不属于DFD（Data Flow Diagram，数据流图）的要素。如果使用DFD对某企业的财务系统进行建模，那么该系统中（请作答此空）可以被认定为外部实体。A.转账单
B.转账单输入
C.接收转账单的银行
D.财务系统源代码程序
考题
（请作答此空）不属于DFD（Data Flow Diagram，数据流图）的要素。如果使用DFD对某企业的财务系统进行建模，那么该系统中（ ）可以被认定为外部实体。A.加工
B.联系
C.数据流
D.数据存储
考题
论数据流图在系统分析与设计中的应用
数据流图 (Data Flow Diagram ，DFD) 是进行系统分析和设计的重要工具，是表达系统内部数据的流动并通过数据流描述系统功能的一种方法。DFD 从数据传递和加工的角度，利用图形符号通过逐层细分描述系统内各个部件的功能和数据在它们之间传递的 情况，来说明系统所完成的功能。在系统分析中，逻辑 DFD 作为需求规格说明书的组成部分，用于建模系统的逻辑业务需求；在系统设计中，物理DFD 作为系统构造和实现的技术性蓝图，用于建模系统实现的技术设计决策和人为设计决策。
请围绕“数据流图在系统分析与设计中的应用”论题，依次从以下三个方面进行论述。
1. 简要叙述你参与的软件开发项目以及你所承担的主要工作。
2. 列举出 DFD 中的几种要素及含义，简要说明在系统分析与设计阶段逻辑 DFD 和物理 DFD 中这些要素之间有何区别。
3. 根据所参与的项目，具体阐述你是如何通过绘制数据流图来进行系统分析与设计的。
考题
（ ） is used to model aggregates of information and the relationships these aggregates have to other. A.DatA.flow diagram
B. Entity relationship diagram
C.Sequence diagram
D.Structure diagram
考题
Which of the following is the definition of CAS latency？（）A、 CAS latency is the ratio between the column access time and the clock cycle time.B、 CAS latency is the ratio between the row access time and the clock cycle time.C、 CAS latency is the ratio between the column access time and the data burst transfer time.D、 CAS latency is the ratio between the row access time and the data burst transfer time.
考题
单选题Which of the following is the definition of CAS latency？（）A
CAS latency is the ratio between the column access time and the clock cycle time.B
CAS latency is the ratio between the row access time and the clock cycle time.C
CAS latency is the ratio between the column access time and the data burst transfer time.D
CAS latency is the ratio between the row access time and the data burst transfer time.
考题
单选题下列描述错误的是（）A
数据流图将各种信息流抽象成数据流的形式B
数据流图不反映控制关系、调用关系C
数据流图不反映处理逻辑的先后顺序D
数据流图不反映数据的流向
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