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问题 单项选择题

通过指定字段的数据类型和宽度来限制该字段的取值范围，这属于数据完整性中的( )。

A) 参照完整性
B) 实体完整性
C) 域完整性
D) 字段完整性

答案

参考答案：C

解析： 域完整性是指通过字段的数据类型和宽度来限制该字段的取值范围。

单项选择题

2011年下半年以来，我国大范围地区普降暴雨。以下关于“暴雨”这一气象现象的说法，错误的是( )。

A．根据我国气象规定，24小时降水量为50毫米或以上的雨称为“暴雨”
B．暴雨按其降水强度可分为暴雨、大暴雨、特大暴雨三个等级
C．由于受夏季风的影响，我国暴雨日及雨量的分布从东南向西北内陆减少，平原多于山地
D．暴雨预警信号分四级，其程度从弱到强排列依次为蓝色、黄色、橙色、红色
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单项选择题

Ravi,like many project__(1)__,had studied the waterfall model of software development as the primary software life-cycle__(2)__.He was all set to use it for an upcoming project,his first assignment.However,Ravi found that the waterfall model could not be used because the customer wanted the software delivered in stages,something that implied that the system had to be delivered and built in__(3)__and not as__(4)__. 　

The situation in many other projects is not very different.The real world rarely presents a problem in which a standard process,or the process used in a previous project,is the best choice.To be the most suitable,an existing process must be__(5)__to the new problem.

A development process,even after tailoring,generally cannot handle change requests.To accommodate change requests without losing control of the project,you must supplement the development process with a requirement change management process.

空白（2）处应选择（）

A.activity

B.procedure

C.process

D.progress
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