正确答案: C

消息人技术

题目：在非安全的通信环境中，为了保证消息来源的可靠性，通常采用的安全防护技术是()

解析：C

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举一反三的答案和解析：

[单选题]●在面向对象方法中，对象可看成是属性（数据）以及这些属性上的专用操作的封装体。封装是一种(46)技术。(46)

信息隐蔽

[单选题]高级程序设计语言中用于描述程序中的运算步骤、控制结构及数据传输的是(20)。

语句

解析：解析：见公共试题Ⅱ(20)。

[单选题]关系模式SCS(Sno，Cno，Score)中，Sno是学生学号，Cno是课程号，Score是成绩。若要查询每门课成绩的平均成绩，且要求查询结果按平均成绩升序排列，平均成绩相同时，按课程号降序排列，可用SQL语言写为(33)。若查询结果仅限于平均分数超过85分的，则应(34)。(51)

SELECT Cno，AVG(Score) FROM SCS GROUP BY Cno ORDER BY 2.Cno DESC

[单选题]以太网100BASE-TX标准规定的传输介质是(61)。

5类UTP

解析：解析：快速以太网有多个物理层标准，使用的传输介质分别是；

[多选题]● At a basic level, cloud computing is simply a means of delivering IT resources as(71) Almost all IT resources can be delivered as a cloud service: applications, compute power, storage capacity, networking, programming tools, even communication services and collaboration (72).Cloud computing began as large-scale Internet service providers such as Google, Amazon,and others built out their infrastructure. An architecture emerged: massively scaled, (73)distributed system resources, abstracted as virtual IT services and managed as continuously configured, pooled resources. In this architecture, the data is mostly resident on (74)“somewhere on the Intemet” and the application runs on both the“cloud servers” and the user's browser.

computers

services

software

disks

machines

tools

vertically

inclined

decreasingly

middleware

servers

hard disks

individual

general

separate

解析：C,D,A,C,B