试题1

At a basic level, cloud computing is simply a means of delivering IT resources as （1）. Almost all IT resources can be delivered as a cloud service: applications, compute power, storage capacity, networking, programming tools, even communication services and collaboration （2）. Cloud computing began as large-scale Internet service providers such as Google, Amazon, and others built out their infrastructure. An architecture emerged: massively scaled, （3）distributed system resources, abstracted as virtual IT services and managed as continuously configured, pooled resources. In this architecture, the data is mostly resident on （4）"somewhere on the Intemet" and the application runs on both the "cloud servers" and the user's browser. Both clouds and grids are built to scale horizontally very efficiently. Both are built towithstand failures of （5）elements or nodes. Both are charged on a per-use basis. But while grids typically process batch jobs, with a defined start and end point, cloud servics can be continuous. What's more, clouds expand the types of resources available——file storage, databases, and Web services——and extend the applicability to Web and enterprise applications.
（1）A. hardware
B. computers
C. services
D. software
（2） A. computers
B. disks
C. machines
D. tools
（3） A. horizontally
B. vertically
C. inclined
D. decreasingly
（4） A. clients
B. middleware
C. servers
D. hard disks
（5） A. entire
B. individual
C. general
D. separate

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试题2

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试题3

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试题4

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试题5

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试题6

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试题7

若某个关系的主码为全码，则该主码应包含 （ ） 。
A、单个属性
B、两个属性
C、多个属性
D、全部属性

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试题8

多媒体中的“媒体”有两重含义，一是指存储信息的实体；二是指表达与传递信息的载体。（ ）是存储信息的实体。
A、文字、图形、磁带、半导体存储器
B、磁盘、光盘、磁带、半导体存储器
C、文字、图形、图像、声音
D、声卡、磁带、半导体存储器

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试题9

某企业生产流水线M共有两位生产者，生产者甲不断地将其工序上加工的半成品放入半成品箱，生产者乙从半成品箱取出继续加工。假设半成品箱可存放n件半成品，采用PV操作实现生产者甲和生产者乙的同步可以设置三个信号量S、S1和S2，其同步模型如下图所示。

信号量S是一个互斥信号量，初值为  （1）；S1、S2的初值分别为  （2）。
（1）
A．0
B．1
C．n
D．任意正整数
（2） A．n、0
B．0、n
C．1、n
D．n、1

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试题10

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