The spiral model is a software development model combining elements of both ( ) and prototyping-in-stages, so it's a healthy mix of top-down and bottom-up concepts。

2023-09-01

A.design
B.progam
C.coding
D.plan

参考答案:A

螺旋模型是结合了设计和阶段原型开发原理的一种软件开发模型,因此是一种自上而下和自下而上概念的良好结合。