正确答案: D

缺点是不支持SQL语言

题目：以下是对关系数据库结构的描述，请选择错误描述的选项。（ ）

解析：D

查看原题

举一反三的答案和解析：

[单选题]试题（20）如果380V电力电缆（承载功率<2kV．A），与综合布线电缆都在接地的线槽中，且平行长度<10m，则两条电缆间最小敷设间距（ 20） mm。

10

解析：试题（20）分析

[单选题]●Extreme Programming (XP) is a discipline of software development with (71) of simplicity, communication,feedback and courage. Successful software development is a team effort-not just the development team, but the larger team consisting of customer, management and developers. XP is a simple process that brings these people together and helps them to succeed together. XP is aimed primarily at object-oriented projects using teams of a dozen or fewer programmers in one location. The principles of XP apply to any (72) project that needs to deliver quality software rapidly and flexibly.An XP project needs a (73) customer to provide guidance. Customers, programmers,managers, are all working (74) to build the system that's needed. Customers - those who have software that needs to be developed - willlearn simple, effective ways to (75) what they need, to be sure that they are getting what they need, and to steer the project to success.

values

[单选题]“军队通用计算机系统使用安全要求”定义，风险分析是指：鉴别风险及确定其可能达到的()，判定潜在的损失，并为制定保护策略提供依据的过程。

限度

解析：答案：C

[单选题]在Linux操作系统中，为了授权用户具有管理员的某些个性需求的权限所采取的措施是什么?

使用visudo命令授权用户的个性需求

解析：答案：C

[多选题]移动用户有些属性信息需要受到保护，这些信息一旦泄露，会对公众用户的生命财产安全构成威胁。以下各项中，不需要被保护的属性是()

终端设备信息

公众运营商信息

[单选题]在Outlook窗口中，新邮件的“抄送”文本框输入的多个电子信箱的地址之间，应用______作分隔。

分号(;)

解析：答案：A