面向对象开发方法主要分为分析、设计和实现三个阶段，下面属于分析阶段主要工作的是（）

单项选择题根据软件生命周期的V模型，系统测试主要针对（），检查系统作为一个整体是否有效地得到运行

A、概要设计 
B、项目范围说明书 
C、项目管理计划 
D、需求规格说明书

单项选择题The intention of the（）is to schedule, organize and control all activities to achieve the project goal eventually.no matter how difficult it is and what kind of risks are there.

A、project work breakdown
B、project security authentication
C、project management
D、project flowchart

单项选择题（）is a type of bar chart that illustrates a project schedule. It illustrates the start and finish dates of the terminal elements and summary elements of a project.

A、gantt chart
B、project histogram
C、milestone chart
D、project flowchart

单项选择题The uncertainty of an event is measured by its probability of occurrence and is inversely proportional to that. The more uncertain an event is. The more information is required to resolve uncertainty of that event. The amount of information is measured in （）

A、possibility
B、bits
C、bps
D、probability

单项选择题Information,in its most restricted technical sense,is a seque of symbols that can be interpreted as a message.ingormation can be recorded as signs,or transmitted as（）

A、symbols
B、message
C、signals
D、wave