题目内容

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______。

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案例分析题若某CPU的有效地址长度为24位，则其寻址范围是（），其虚拟存储器的容量为（）。其虚拟存储器的容量为（）

A. 4M
B. 8M
C. 16M
D. 32G

文件是如何进行分类的举例说明。

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（）。则分解ρ=R1(ABCE)，R2(CD)满足（）

A. 具有无损连接性、保持函数依赖
B. 不具有无损连接性、保持函数依赖
C. 具有无损连接性、不保持函数依赖
D. 不具有无损连接性、不保持函数依赖

案例分析题Currently the Pentium chip or （） , made by （） , is the most common CPU though there are many other companies that produce processors for personal computers. One example is the CPU made by Motorola which is used in Apple computers. With faster processors the clock speed becomes more important. Compared to some of the first computers which operated at below 30 megahertz ( （） ) the Pentium chips began at 75 megahertz in the late 1990g. As of mid 2003 speeds now exceed 3000 + megahertz or 3 gigahertz (check your local computer store for the latest speed) . It depends on the （） that the chip is housed in, or the （） , as to whether you are able to upgrade to a faster chip. The motherboard contains the circuitry and connections that allow the various component to communicate with each other. Compared to some of the first computers which operated at below 30 megahertz ( （） ) the Pentium chips began at 75 megahertz in the late 1990g.

A. MHz
B. MEG
C. MTZ
D. MGH