题目内容
在软件生存中， 30 阶段所占的工作量最大，约70%。结构化分析方法产生的系统说明书由一套分层的 31 图、一本数据字典、一组说明以及补充材料组成。软件的 32 一般由两次故障时间和故障平均恢复时间来度量。采用 33 编写程序，可提高程序的可移植性。仅根据规格说明书描述的程序功能来设计测试用例的方法称为 34 。
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在软件开发过程中常用图来作为描述的工具。DFD就是面向 20 分析方法的描述工具。在一整套分层DFD中，如果某一张图中有N个加工(Process)，则这张图允许有 21 张子图。在一张DFD图中，任意两个加工之间 22 。在画分层DFD的时候，应注意保持 23 之间的平衡。DFD中从系统的输入流到系统的输出流之间的一连串连续变换形成一种信息流，这种信息流可分为 24 两大类。
一个好的模式设计应符合下列原则____
DOM is a platform-and language- 15 API that allows programs and scripts to dynamically access and update the content, structure and style of WWW documents (currently, definitions for HTML and XML documents are part of the specification). The document can be further processed and the results of that processing can be incorporated back into the presented 16 . DOM is a 17 -based API to documents, which requires the whole document to be represented in 18 while processing, it. A simpler alternative to DOM is the event-based SAX, which can be used to process very large 19 documents that do not fit info the memory available for processing.
DOM is a platform-and language- 15 API that allows programs and scripts to dynamically access and update the content, structure and style of WWW documents (currently, definitions for HTML and XML documents are part of the specification). The document can be further processed and the results of that processing can be incorporated back into the presented 16 . DOM is a 17 -based API to documents, which requires the whole document to be represented in 18 while processing, it. A simpler alternative to DOM is the event-based SAX, which can be used to process very large 19 documents that do not fit info the memory available for processing.
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