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2021 数学史(首都师范大学)1465920448 最新满分章节测试答案
2021 大学英语学术写作(南京大学)1465149445 最新满分章节测试答案
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本课程起止时间为:2021-09-06到2022-01-10
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Lesson 1 Academic Writing & Critical Thinking
1、 问题:Read the following passage about Zoos and answer the questions.Zoos have existed in some form since at least 2500 BC in Egypt and Mesopotamia, where records indicate giraffes, bears, dolphins, and other animals were kept by aristocrats. The oldest still operating zoo in the world, Tiergarten Schönbrunn in Vienna, opened in 1752. Although controversy has historically surrounded zoos, from debates over displaying "exotic" humans in exhibits to zookeepers not knowing what to feed animals, I do believe that zoos should exist. ①In my opinion, zoos are important institutions that promote scientific research and public education, and save animals from extinction.First of all, zoos produce helpful scientific research. 点我阅读全文
2022 比较文学(华中师范大学)1467149474 最新满分章节测试答案
2021 大学英语(三)(中国人民解放军陆军装甲兵学院) 最新满分章节测试答案
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本课程起止时间为:2021-03-02到2024-02-26
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unit7 Transportation Unit7 test
1、 问题:Section A Directions: Read the conversation below and find proper expressions to fill in the blanks.Mary: What do you think is a good school?Amy: In my opinion, the good school is the one that makes a balance between discipline and fun, because too much focus on discipline can make a school like a prison, and excessive focus on fun makes it a park rather than a school.Mary: I completely agree with you, Amy. Balance is better.Paul: I’m sorry to say this, but I totally disagree with you. My reason is: what is the point of fun in a school? 点我阅读全文
2021 计算机与网络基础(成都理工大学) 最新满分章节测试答案
2021 普通物理力学上(刘兆龙)(北京理工大学) 最新满分章节测试答案
2022 数值天气预报2022春(南京信息工程大学) 最新满分章节测试答案
2021 计算机网络(哈尔滨工业大学)1465385454 最新满分章节测试答案
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本课程起止时间为:2021-08-31到2021-11-30
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【作业】第1周 计算机网络概述 (4h24m58s) 作业1
1、 问题:如图所示网络。A在t=0时刻开始向C发送一个2Mbits的文件;B在t=0.1+e秒(e为无限趋近于0的小正实数)向D发送一个1Mbits的文件。忽略传播延迟和结点处理延迟。请回答下列问题:1) 如果图中网络采用存储-转发方式的报文交换,则A将2Mbits的文件交付给C需要多长时间?B将1Mbits的文件交付给D需要多长时间?2) 如果图中网络采用存储-转发方式的分组交换,分组长度为等长的1kbits,且忽略分组头开销以及报文的拆装开销,则A将2Mbits的文件交付给C需要大约多长时间?B将1Mbits的文件交付给D需要大约多长时间?3) 报文交换与分组交换相比,哪种交换方式更公平?(即传输数据量小用时少,传输数据量大用时长)
评分规则: 【 评分标准:1) 本小题满分12分,只要认真完成作业(无论对错),就可以得到基本分:5分;2) 每个小问正确解答,参考答案中标注分数给分,共14分;3)结果不正确但分析过程正确或部分正确,可酌情给分。参考答案:1) 由于A先发报文所以,A的报文在路由器的队列中排在B的报文前面,所以A交付2Mbits报文需要时间为:2/10+2/20+2/10=0.5s=500ms;(3分)B将1Mbits的文件交付给D需要时间为:1/10+2/20(排队时间)+1/20+1/10=0.35s=350ms。(3分)2) 从t=0时刻到t=0.1s,A发送了1000个分组,用时:1000×1000/10000000=0.1s,从t=0.1s时刻起与B共享连接路由器的链路,平均各共享到带宽10Mbps,A大约再用时:1/10+2×1000/10000000=0.1002s交付剩余的1000个分组,故A向C交付2Mbits文件大约需要(0.1+0.1002)s≈0.2s;(3分)B向D交付1Mbits文件需要时间大约为:1/10+2×1000/10000000=0.1002s≈0.1s。(3分)3) 分组交换比报文交换更公平。(2分)
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