单选
● As an operating system repeatedly allocates and frees storage space, many physically separated unused areas appear. This phenomenon is called （71） .
（71）
相关试题
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● A （75） infected computer may lose its data.
（75）
- A. file
- B. data base
- C. virus
- D. program
-
● We can use the word processor to （74） your documents.
（74）
- A. edit
- B. compute
- C. translate
- D. unload
-
● To document your code can increase program （72） and make program easier to （73）.
（72）
- A. reliability
- B. security
- C. readability
- D. usability （73）
- A. execute
- B. interpret
- C. compile
- D. maintain
-
● As an operating system repeatedly allocates and frees storage space, many physically separated unused areas appear. This phenomenon is called （71） .
（71）
- A. fragmentation
- B. compaction
- C. swapping
- D. paging
-
● 网络用户能进行 QQ聊天， 但在浏览器地址栏中输入 www.ceiaec.org 却不能正常访问该页面，此时应检查 （68）
（68）
- A. 网络物理连接是否正常
- B. DNS 服务器是否正常工作
- C. 默认网关设置是否正确
- D. IP地址设置是否正确
-
● 一个 HTML 文件的起始标记为 （69） 。
（69）
- A.
- B.
</li> <li>C. <html> </li> <li>D. <meta></li> </ul> <div class="button"> <a href="/question/20210416170703900842659840.html" role="button" class="weui-btn weui-btn_default weui-btn_medium">点击查看答案</a> </div> </li> <li> <h3><a href="/question/20210416170703902591684608.html"><p> ● ARP协议的功能是 （70） 。</p><p> （70）</p></a></h3> <ul> <li>A. 由目标的 IP地址求目标的 MAC 地址 </li> <li>B. 由目标的 MAC 地址求目标的 IP地址</li> <li>C. 由源的 IP地址求源的 MAC 地址 </li> <li>D. 由源的 MAC 地址求源的 IP地址</li> </ul> <div class="button"> <a href="/question/20210416170703902591684608.html" role="button" class="weui-btn weui-btn_default weui-btn_medium">点击查看答案</a> </div> </li> <li> <h3><a href="/question/20210416170703895436201984.html"><p>● 安全的 Web 服务器与客户机之间通过 （66） 协议进行通信。</p><p> （66）</p></a></h3> <ul> <li>A. HTTP＋SSL </li> <li>B. Telnet＋SSL </li> <li>C. Telnet＋HTTP </li> <li>D. HTTP＋FTP</li> </ul> <div class="button"> <a href="/question/20210416170703895436201984.html" role="button" class="weui-btn weui-btn_default weui-btn_medium">点击查看答案</a> </div> </li> <li> <h3><a href="/question/20210416170703897222975488.html"><p> ● 下列 Internet 应用中，传输层需要采用 UDP 协议的是 （67） 。</p><p> （67）</p></a></h3> <ul> <li>A. IP 电话 </li> <li>B. 浏览 Web 页面 </li> <li>C. telnet </li> <li>D. 发送电子邮件</li> </ul> <div class="button"> <a href="/question/20210416170703897222975488.html" role="button" class="weui-btn weui-btn_default weui-btn_medium">点击查看答案</a> </div> </li> <li> <h3><a href="/question/20210416170703891833294848.html"><p>● 某一类应用问题中，需要求正比例函数与反比例函数之和的极值。例如，正比例函数 4x 与反比例函数 9/x 之和用 f(x)表示， 即 f(x)=4x + 9/x， （x>0） ,那么函数 f(x) （63） 。 </p><p> （63）</p></a></h3> <ul> <li>A. 没有极小值 </li> <li>B. 在 x=1 时达到极大值</li> <li>C. 在 4x=9/x 时达到极小值 </li> <li>D. 极大值是极小值的 9/4 倍</li> </ul> <div class="button"> <a href="/question/20210416170703891833294848.html" role="button" class="weui-btn weui-btn_default weui-btn_medium">点击查看答案</a> </div> </li> </ol> </div> </div> <div class="weui-panel listpaper"> <div class="weui-panel__hd"><i class="fa fa-yc-square"></i><span>相关试卷</span></div> <div class="weui-panel__bd"> <div class="weui-media-box weui-media-box_small-appmsg"> <div class="weui-cells"> <a class="weui-cell weui-cell_active 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