瀑布模型是传统的软件开发过程模型，它强调各阶段的严格性，其主要缺点是______。

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问题瀑布模型是传统的软件开发过程模型，它强调各阶段的严格性，其主要缺点是______。

选项 A、需要软件人员和用户进行沟通
B、需要付出较高的维护成本
C、开发的软件不易于移植
D、不适应需求不确定的软件开发

答案D

解析瀑布模型规定了软件开发各阶段具有严格的先后衔接顺序，如瀑布流水，逐级下落。每阶段在上一阶段的结果基础上进行，并给出本阶段的工作成果．但瀑布模型缺乏灵活性，特别是无法解决软件需求不明确或不准确的问题，而这些问题的存在可能导致开发出的软件不是用户真正需要的。本题正确答案为选项D。

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