题目内容
（请给出正确答案）
●以下关于哈夫曼编码的叙述中，正确的是(63)。
(63)A．哈夫曼编码是一种有损压缩方法
B．编码过程中需要根据符号出现的概率来进行编码
C．编码过程中需要建立“词典’
D．哈夫曼编码方法不能用于对静态图像进行压缩、
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更多“●以下关于哈夫曼编码的叙述中，正确的是（63)。（63)A．…”相关的问题
(67)A．A类地址、B类地址、C类地址
B．单播地址、组播地址、任意播地址
C．单播地址、组播地址、广播地址
D．公共地址、站点地址、接口地址
●The traditional model for systems development was that an IT department used (71)which is a process-centered technique, and consulted users only when their input or approval was needed. Compared with traditional methods, many companies find that JAD allows key users to participate effectivelyin the (72). When properly used, JAD can result in a more accurate statement of system requirements, a better understanding of common goals and a stronger commitment to the success of the new system. RAD is a team-based technique that speeds up information systems development and produces a functiog.information system. Whilethe end productof jAD is a(an)(73),theendproduct of RAD is the (74) .The RAD model consists offour phases. During the(75),users interact with systems analysts and develop models and prototypes that represent all system processes, outputs, and inputs.
(71) A. structured analysis
B. object-oriented analysis
C. prototype analysis
D. process analysis
(72) A. initial scope definition
B. requirements modeling process
C. object modeling process
D. architecture design process
(73) A. data flow diagram
B. entity relationstip model
C. requirements model
D. object model
(74) A. system proposal
B. system design model
C. new system architecture
D. new information system
(75) A. requirements planning phase
B. user design phase
C. construction phase
D. cutover phase
(32)A．任何复杂的程序流程图都应该由顺序、选择、循环结构构成
B.IPO图不适合用来进行流程设计
C．PAD图是一种支持原型化设计方法的图形工：
D．N-S图容易表示嵌套关系和层次关系，特别适合于设计非常复杂的流程
(56)A．7
B．8
C．9
D．10
(60) A.1.333
B.1.923
C.1.5
D.1.829
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