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问题 单项选择题

某企业内部网络中一台计算机的IP地址为10.3.1.21。假设该计算机请求某Internet网站的index.html页面时，使用的HTTP/1.1协议以持续的非流水线方式工作，一次请求响应时间为RTT，index.html页面大小约为1.2KB且引用了6个JPEG小图像，则该计算机发出的GET HTTP/1.1 Web请求的数据帧经过该企业网络边界路由器R转发时，需修改所封装的IP分组(包)头部中的字段数量至少为______个；该计算机从发出GET/index.html HTTP/1.1这一Web请求开始到浏览器收到index.html页面全部内容为止，需要______个RTT。

A．1
B．2
C．3
D．4

答案

参考答案：C

单项选择题

起重机作业前应检查的工作范围，清除妨碍起重机行走及回转的（）。检查轨道是否平直，有无沉陷；轨距及高差是否符合规定。

A.障碍物

B.安全装置

C.行走装置

D.回转装置
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填空题

For more than two centuries, American’s colleges and universities have been the backbone of the country’s progress. They have educated the technical, managerial, (1) and provided generation after generation of national leaders. Today educators from around the globe are turning to U. S. institutions of higher learning (2) . They are apt to find many reasons for the excellence of American universities, but (3) stand out as watersheds:
Education (4) : In 1862 Congress enacted the Land-Grant College Act, which essentially extended the opportunity of higher education (5) , including such disenfranchised groups as women and minorities. Each state was permitted to sell large tracts of (6) and use the proceeds to endow at least one public college.
(7) : Over the years, the decentralization and diversity of the America’s colleges and universities have promoted competition for students and resources. Competitive pressure first arose (8) . The academy’s impact really grew after World War II, when (9) commissioned by President Roosevelt argued that it was the federal government’s responsibility to (10) for basic research. Instead of being centralized in government laboratories, scientific research (11) in American universities and generated increasing investment. It also gave graduate students research opportunities and helped (12) far and wide, to the benefit of industry, medicine and society as a whole.
(13) : The end of the World War II saw passage of the Servicemen’s Readjustment Act of 1944. The law, which provided for (14) for returning veterans, made an already democratic higher-education system accessible in ways that were (15) in Europe, opening the doors of the best universities to men and women who had (16) of going to college.
(17) : The creation of federal loan guarantees and subsidy programs, as well as outright grants for college students brought (18) to higher education and further helped to democratize access. Since its founding (19) , the Federal Family Education Loan Program has funded more than 74 million student loans worth more than (20) .
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