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案例分析题给定关系模式R（U，F），U=A，B，C，D，E，F=B→A，D→A，A→E，AC→B，其候选关键字为（），则分解ρ=R1（ABCE），R2（CD）满足（）。给定关系模式R（U，F），U=A，B，C，D，E，F=B→A，D→A，A→E，AC→B，其候选关键字为（）

ABD
B. ADE
C. ACD
D. CD

案例分析题The Rational Unified Process (RUP) is a software engineering process, which captures many of best practices in modem software development. The notions of （） and scenarios have been proven to be an excellent way to capture function requirements. RUP can be described in two dimensions - time and content. In the time dimension, the software lifecycle is broken into cycles. Each cycle is divided into four consecutive （） which is concluded with a well-defined （） and can be further broken down into （） - a complete development loop resulting in a release of an executable product, a subset of the final product under development, which grows incrementally to become the final system. The content structure refers to the disciplines, which group （） logically by nature. The content structure refers to the disciplines, which group （） logically by nature.

A. functions
B. workflows
C. actions
D. activities

The mineral industry in New Mexico is one of the most strongest economic forces.

如果要把某文件中的长度分别为L1、L2、L3的3个逻辑记录L1、L2、L3依次写到磁盘上，而磁盘上的分块长度大于这3个逻辑记录的总长时，则可采用______。