(22)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
A.加工
B.联系
C.数据流
D.数据存储
A.加工
B.联系
C.数据流
D.数据存储
下列Verilog HDL程序所描述电路功能是( ) module Dataflow( A, En, Y); input [2:0] A; //输入端口声明 input En; //输入端口声明 output [7:0]Y; //输出端口声明 assign Y[0] = ~( En & ~A[2] & ~A[1] & ~A[0] ); assign Y[1] = ~( En & ~A[2] & ~A[1] & A[0] ); assign Y[2] = ~( En & ~A[2] & A[1] & ~A[0] ); assign Y[3] = ~( En & ~A[2] & A[1] & A[0] ); assign Y[4] = ~( En & A[2] & ~A[1] & ~A[0] ); assign Y[5] = ~( En & A[2] & ~A[1] & A[0] ); assign Y[6] = ~( En & A[2] & A[1] & ~A[0] ); assign Y[7] = ~( En & A[2] & A[1] & A[0] ); endmodule
A、8/3线编码器
B、3/8线译码器
C、加法器
D、数据选择器
A.面向作业处理的系统
B.面向管理控制的系统
C.面向决策计划的系统
D.面向数据汇总的系统
Information systems planners inaccordance with the specific information system planning methods developedinformation architecture.Information Engineering follow(71)approach,inwhich specific information systems from a wide range of information needs inthe understanding derived from(for example,we need about customers,products,suppliers,sales andprocessing of the data center),rather than merging many detailed information requested(orders suchas a screen or in accordance with the importation of geographical sales summaryreport).Top-down planning will enable developers(72)informationsystem,consider system components provide an integrated approach to enhance the information system and therelationship between the business objectives of the understanding,deepen theirunderstanding of information systems throughout the organization inunderstanding the impact.
InformationEngineering includes four steps:(73),(74),design and implementation. The planning stage of project informationgenerated inforamtion system architecture,(75)enterprisedata model.
A.Down-top planning
B.sequence planning
C.Top-down planning
D.parallel planning
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