题目:The idea of minimizing risk via the use of prototypes and other means is the concept underlying the spiral model. A simplistic way of looking at this life-cycle model is as a waterfall model with each phase preceded by()analysis. 通过使用原型和其他手段最小化风险的想法是螺旋模型的基础的概念。看待这个生命周期模型的一个简单的方式是将该模型看作每个阶段之前都有()分析的瀑布模型。
A. possibility
B. testing
C. decision
D. risk
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