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原型生命周期对于某些特殊情况的应用可以采取灵活的做法，下述
Ⅰ．原型化必须从定义阶段开始
Ⅱ．可购买应用系统为初始原型
Ⅲ．对系统的子系统进行原型化
Ⅳ．仅对屏幕的原型化
哪个是对原型化不必要的约束?
A.Ⅰ
B.Ⅱ
C.Ⅲ
D.Ⅳ

A.原型化必须从定义阶段开始
Ⅱ．可购买应用系统为初始原型
B.对系统的子系统进行原型化
Ⅳ．仅对屏幕的原型化
C.Ⅰ
B.Ⅱ
C.Ⅲ
D.Ⅳ
【参考答案】

A
解析：原型化生命周期对自身的约束有仅对屏幕的原型化；可购买应用系统为初始原型；对系统的子系统进行原型化；可行......

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