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有一个段页式虚拟存储器，其虚地址有2位段号，3位页号，9位页内位移，该地址空间中共有(22)虚页。
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All computers need some sort of(71)(OS). Tile majority of modem home computers use some form. of Microsofts OS. The original Microsoft OS was called DOS though most computers use Windows. Windows comes in various versions beginning with(72)x then 95, 98, ME and currently XP. A few computers use IBMs O/SApples Mac uses their own OS beginning with OS I though most modem Macs use version x or x. Apples latest version is OS 10.x. In the past large companies and institutions would have an OS design exclusively for them but as the Commercial OS become more sophisticated the benefits of this practice is becoming less apparent. Some computer professionals,(73)(ISP)and(74)computer users use an OS such as UNIX(or a variant such as Linux), Windows NT or 2000(Win2k)or one of the other network or(75)based OS.
下图是计算机硬件的结构图，相应空白处对应的硬件分别是(31)，(32)。
基于对象关系数据模型的DBS称为对象关系数据库系统，即(63)。
A．可行性研究B．需求分析C．概要设计D．详细设计
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