以下关于系统性能评估方法的描述，错误的是____。
A.指令执行速度法常用每秒百万次指令运算（MIPS）评估系统性能
B.基准程序法主要针对CPU（有时包括主存）的性能，但没有考虑I/O结构、操作系统、编译程序的效率等对系统性能的影响
C.等效指令速度法评估系统性能时需要计算各类指令在程序中所占的比例
D.综合理论性能法（CPT）采用每秒百万次理论运算（MTOPS）评估系统性能

The project workbook is not so much a separate document as it is a structure imposed on the documents that the project will be producing anyway.All the documents of the project need to be part of this （　）. This includes objectives ,external specifications , interface specifications , technical standards , internal specifications and administrative memoranda(备忘录).Technical prose is almost immortal. If one examines the genealogy ( Ff ) of a customer manual for a piece of hardware or software , one can trace not only the ideas , but also many of the very sentences and paragraphs back to the first （请作答此空） proposing the product or explaining the first design. For the technical writer, the paste-pot is as mighty as the pen.Since this is so, and since tomorrow's product-quality manuals will grow from today’s memos, it is very important to get the structure of the documentation right. The early design of the project （ ） ensures that the documentation structure itself is crafted, not haphazard. Moreover, the establishment of a structure molds later writing into segments that fit into that structure.The second reason for the project workbook is control of the distribution of （ ）. The problem is not to restrict information, but to ensure that relevant information gets to all the people who need it.The first step is to number all memoranda, so that ordered lists of titles are available and h worker can see if he has what he wants. The organization of the workbook goes well beyond this to establish a tree-structure of memoranda. The （ ） allows distribution lists to be maintained by subtree, if that is desirable.
A. OBJECTIVE
B. MEMORANDA
C. STANDARD
D. SPECIFICATION

假定用户A、B分别在I1和I2两个CA处取得了各自的证书，下面（）是A、B互信的必要条件。
A.A、B互换私钥
B.A、B互换公钥
C.I1、I2互换私钥
D.I1、I2互换公钥

某双端队列如下图所示，要求元素进出队列必须在同一端口，即从A端进入的元素必须从A端出、从B端进入的元素必须从B端出，则对于4个元素的序列e1、e2、e3、e4，若要求前2个元素(e1、e2)从A端口按次序全部进入队列，后两个元素(e3、e4)从B端口按次序全部进人队列，则可能得到的出队序列是（60）。
A.e1、e2、e3、e4
B.e2、e3、e4、e1
C.e3、e4、e1、e2
D.e4、e3、e2、e1

下列活动，（26）不属于需求开发活动的范畴。
A.跟据系统需求识别和确认系统功能
B.将所收集的用户需求编写成文档和模型
C.针对系统特点，考虑并确定系统开发平台与程序设计语言
D.了解实际用户任务和目标以及这些任务所支持的业务需求

假设系统中有n个进程共享3台打印机，任一进程在任一时刻最多只能使用1台打印机。若用PV操作控制n个进程使用打印机，则相应信号量s的取值范围为（）；若信号量S的值为-3，则系统中有（请作答此空）个进程等待使用打印机。
A.0
B.1
C.2
D.3