题目内容

4.Having trust in each other is very important because doing business requires good interpersonal relationships.

A. 有了信誉才有助于搞好对别人的关系，也有助于企业的发展。
B. 彼此之间的信任非常重要,因为做生意需要良好的人际关系。
C. 建立良好的人际关系至关重要，因为做生意必须要相互信任.

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Grounds Maintenance WorkersWhat Grounds Maintenance (维护) Workers DoGrounds maintenance workers ensure that the grounds of houses, businesses, and parks are attractive, orderly, and healthy in order to provide a pleasant outdoor environment.Work EnvironmentMany grounds maintenance jobs are seasonal, available mainly in the spring, summer, and fall. Most of the work is done outdoors in all weather conditions.How to Become a Grounds Maintenance WorkerMost grounds maintenance workers need no formal education and are trained on the job.TrainingA short period of on-the-job training is usually enough to teach new hires the skills they need, which often include how to plant and maintain areas and how to use some tools and other equipment.PayThe hourly wage for grounds maintenance workers was $12.90 in May 2016.Questions:

关系模式R(W,X,Y,Z),其函数依赖的集合是F=｛WX→Y, W→X, X→Z, Y→W｝，则该关系模式属于第几范式？

A. 第一范式
B. 第二范式
C. 第三范式
D. BC范式

关系模式R属性集为:{A,B,C},函数依赖F={AB→C,AC→B,B→C},则R属于第几范式？

A. 第一范式
B. 第二范式
C. 第三范式
D. BC范式

不存在非主属性部分函数依赖于码，但存在非主属性传递函数依赖于码的关系模式属于第几范式?

A. 1NF
B. 2NF
C. 3NF
D. 4NF