案例分析题一条指令的执行可划分成取值,分析和执行三个部分,不同的部分由不同自由独立的硬件完成设每一指令完成取值,分析和执行三部分的时间分别为2ns,3ns,1ns现有100条指令,若顺序执行这些指令需要();若采用流水方式执行这些指令则需要()。 一条指令的执行可划分成取值,分析和执行三个部分,不同的部分由不同自由独立的硬件完成设每一指令完成取值,分析和执行三部分的时间分别为2ns,3ns,1ns现有100条指令,若顺序执行这些指令需要()
A. 200ns
B. 300ns
C. 500ns
D. 600ns
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案例分析题数据模型的三要素指();其中()是对数据系统的静态特性的描述,()是对数据库系统的动态特性的描述。 ()是对数据库系统的动态特性的描述。
A. 数据值
B. 数据类型
C. 数据结构
D. 数据操作
案例分析题Object-oriented analysis (OOA) is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis consists of three steps. The first step is () . It determines how the various results are computed by the product and presents this information in the form of a () . and associated scenarios. The second is () , which determines the classes and their attributes; Then determine the interrelationships and interaction among the classes. The last step is () , which determines the actions performed by or to each class or subclass and presents this information in the form of () . The second is () , which determines the classes and their attributes.
A. use-case modeling
B. class modeling
C. dynamic modeling
D. behavioral modeling
案例分析题As mentioned above, C imposes relatively few built - in ways of doing things on the program- mer. Some common tasks, such as manipulating (1) , (2), and doing (3) (I/O), are performed by calling on library functions. Other tasks which you might want to do, such as creating or listing directories, or interacting with a mouse, or displaying windows or other (4) elements, or doing color graphics, are not defined by the C language at all. You can do these things from a C program, of course, but you will be calling on services which are peculiar to your programming environment (5), processor, and operating system) and which are not defined by the C standard. Since this course is about portable C programming, it will also be steering clear of facilities not provided in all C environments. (5)处应选择()
A. gatherer
B. translator
C. generator
D. compiler