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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。
A.design
B.progam
C.coding
D.plan
B.progam
C.coding
D.plan
参考答案
参考解析
解析：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。
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空白（2）处应选择（）A
activityB
procedureC
processD
progress
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