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进程管理是操作系统的核心，它的可靠性和安全性直接影响到计算机系统的可用性。在进程管理设计中，由于设计不妥，会出现与系统安全有关的问题，请解释死锁的概念?死锁产生的原因以及如何解除和预防死锁?
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
4950
描述程序处理过程的工具称为详细设计工具，这些工具应该能支持对详细设计无二义性的描述，其中包括控制流程、处理功能、数据组织以及其他方面的实现细节，从而在编码阶段就能把所描述的详细处理过程直接翻译成程序代码。回答下列问题： 1．程序流程图的缺点。
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
940
在SQL语言中，一个表或者是一个基本表(Basetable)，或者是一个视图(View)。基本表是实际存储在数据库中的表，而视图则不是实际存储在数据库中的表。试回答以下有关视图问题： 1．SQL语言中如何理解视图的基本概念。 2．SQL语言中定
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
4550
The underlying technology that makes B-ISDN is called
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
350
Three concepts are central to the OSI model: Service, Interface and
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
460
In most WANs, the network contains numerous cables or telephone lines, each one connecting a pair of
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
450
Local bus can reduce the occupation time of CPU.For the PCI local bus, commonly the time can be reduced to
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
5020
Typical MISD (multiple-instruction single-data stream) computing mode is
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
340
Which of the following is not among the basic features of a relational database?
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
4680
Which of the following is not responsibility of DBA(Data Base Administrator)?
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
390
The software structure is an expression of the relationship among software modules.In the following phrases, which are NOT the r
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
310
The task of the general design stage in structured life circle method is, to build what kind of software system structure?
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
280
In a tree directory of a file system, relative path name can be used to find files for improving directory retrieval.To do this,
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
550
To control and manage processes, which of the following data structures should be set up?
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
330
Suppose two dimensional array A[0..8, 0..9] (with element length of 2 bytes) is stored using row major order, and the base addre
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
460
Suppose a given binary tree has 10 leaf nodes, the number of nodes with degree of 2 is
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
450
which descnption is NOT true?
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
300
The range of an 8bit fixed point integer numbers(no signs)is
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
370
Internet的基本服务，如电子邮件E-mail、远程登录Telnet、文件传输FTP与WWW浏览等，它们的应用软件系统设计中都采用了
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
410
千兆位以太Gigabit Ethernet与快速以太网Fast Ethernet相同之处是：同样保留着传统的10 Mbps Ethernet的基本特征，而且把每个比特的发送时间降低为
笔试原NCRE全国计算机四级NCRE全国计算机四级
admin2009-2-24
370