According to politicians, when children commit crimes, they should be treated in the same way as
A. murderers.
B. criminals.
C. victims.
D. adults.
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假设将某系统的某一部件的处理速度加快到10倍，但该部件的原处理时间仅为整个运行时间的30%，则采用加快措施后能使整个系统的性能提高多少( )
A. 0.37
B. 1.37
C. 2.37
D. 3.37
文件系统的主要目的是( )。
A. 实现按名存取
B. 实现虚拟存储器
C. 提高外部设备的输入输出设备
D. 用于存储系统文档
What operation on relations R and S produces the relation shown below ( ){tuple | tuple∈R∧tuple∈S}
A. union
B. difference
C. intersection
D. division
How many equal valuable relation does set E process ( )E={0,1,2}
A. 3
B. 4
C. 5
D. 6
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