单项选择题

常见的软件开发模型有瀑布模型、演化模型、螺旋模型、喷泉模型等。其中 （7）适用于需求明确或很少变更的项目，（8）主要用来描述面向对象的软件开发过程。

A．瀑布模型
B．演化模型
C．螺旋模型
D．喷泉模型
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单项选择题
A．在合同协议书内应明确注明开工日期B．在合同协议书内应明确注明竣工日期C．在合同协议书内应明确注明合同工期总日历天数D．通过招标选择承包人的项目，其合同工期天数就是招标文件要求的工期天数
A．在合同协议书内应明确注明开工日期
B．在合同协议书内应明确注明竣工日期
C．在合同协议书内应明确注明合同工期总日历天数
D．通过招标选择承包人的项目，其合同工期天数就是招标文件要求的工期天数
单项选择题
During the project, requirements change for a variety of reasons. As needs change and as work proceeds, additional requirements are derived and changes may have to be made to the existing requirements. It is essential to manage these additions and changes efficiently and effectively. To effectively analyze the impact of the changes, it is necessary that the source of each requirement is known and the rational e for any change is documented. The project manager may, however, want to track appropriate measures of requirements volatility to judge whether new or revised （75）are necessary.
A．proceedings
B．controls
C．forecasting’s
D．prelibations
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