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的可控性特点。它有两个显著特点，一是采用（）方式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。
问题1选项
A.逐步交付
B.顺序
C.循环
D.增量
问题2选项
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
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