螺旋模型是一种演进式的软件过程模型，结合了原型开发方法的系统性和瀑布模型可控性特点。它有两个显著特点，一是逐步加深系统定义和实现的深度，降低风险；二是确定一系列 （ ） ，确保项目开发过程中的相关利益者都支持可行的和令人满意的系统解决方案。
- A.实现方案
- B.设计方案
- C.关键点
- D.里程碑
正确答案及解析
正确答案
解析
螺旋模型将瀑布模型和快速原型模型结合起来，强调了其他模型所忽视的风险分析，特别适合于大型复杂的系统，它的特点之一是循环反复。在螺旋模型演进式的过程中，确定一系列的里程碑，以确保项目朝着正确的方向前进，同时降低风险。
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