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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:

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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

关于存货可变现净值的确定,下列各项中正确的有( )。

A. 备售产成品的可变现净值为该产成品的估计售价
B. 备售产成品的可变现净值为该产成品的估计售价减估计销售税费
C. 备售原材料的可变现净值为该原材料的估计售价
D. 备售原材料的可变现净值为该原材料的估计售价减估计销售
E. 备售原材料的可变现净值为该原材料生产的产成品估计售价减估计销售税费

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