分集介绍:这一讲过渡到非齐次方程组,还是以2x2常系数方程组为例,以矩阵形式x'=Ax+r进行讲解。首先,教授介绍了两个相关定理,为求解做了铺垫。然后介绍了x'=Ax的基本矩阵X。最后通过参

发表于:2018-12-09 / 阅读(59) / 评论(0) 分类 麻省理工学院公开课:微分方程

Sometimes we dont have the money we need to accomplish a goal. Borrowing money can help, but if we arent aware of how the system works, it can create bigger problems for us. This is Borrowing Money in Plain English. Among friends, borrowing money see

发表于:2018-12-11 / 阅读(94) / 评论(0) 分类 英语解说豆知识2009年

就算失败99次,我也要努力凑个整 过完十五年才完,各位开工大吉,开学大吉,为了讨个好彩头,来点鼓舞人心的,振奋振奋精神,以图今年过得牛逼闪闪~~以下是知乎精选: What are the most ins

发表于:2019-01-03 / 阅读(70) / 评论(0) 分类 实用英语

More Than 5 Million Cyber Attacks in Kenya 肯尼亚去年发生五百多万次网络攻击 There were 5.4 million cyber-attacks recorded last year in Kenya. That is more than double the number recorded in 2013. 去年,肯尼亚记录到540万起网络

发表于:2019-01-08 / 阅读(86) / 评论(0) 分类 2015年VOA慢速英语(七)月

Guangdong province has purchased 1.5 million doses of hepatitis B vaccine after health authorities halted the use of a brand that may have killed six baby deaths in Guangdong, Hunan and Sichuan provinces. The cause of death of the babies has not yet

发表于:2019-01-16 / 阅读(76) / 评论(0) 分类 CCTV9英语新闻2013年12月

B: Hello, Sir, may I help you? A: Yes. I would like some information for requesting a loan. B: Very well, here are the general terms of our loan policies. We pride ourselves in having the lowest interest rate in the country for personal loans. A: I s

发表于:2019-01-20 / 阅读(52) / 评论(0) 分类 纯正地道美语

1. forty winks 1. 白天小睡;尤指打盹儿,午睡(非正式用语) If you have forty winks, you have a short sleep, or a nap. 如果你have forty winks,那表示你小睡,小憩一会儿。 E.g. If I have a late night I sometimes catch fort

发表于:2019-02-02 / 阅读(72) / 评论(0) 分类 英语口语

A longtime roller coaster fan has celebrated his 5,000th ride on a western Pennsylvania coaster over the holiday weekend and he did it with close to triple-digit rides in a single day. 一个老过山车迷在周末假期庆祝了他在宾夕法尼亚州

发表于:2019-02-03 / 阅读(78) / 评论(0) 分类 英语新闻

Defending champion China won the women's team title for the 20th time after beating Japan 3-0 in the final of the 2016 World Team Table Tennis Championships here on Sunday. 周日,在2016年世界乒乓球锦标赛决赛当中,卫冕冠军中国队

发表于:2019-02-03 / 阅读(60) / 评论(0) 分类 英语新闻

Now score it Lionel Messi 5, Cristiano Ronaldo 3. 目前所获金球奖数:梅西五个,C罗三个。 Messi won the Ballon d'Or trophy in Zurich on Monday as the world's best player in 2015, ending Cristiano Ronaldo's two-year hold on soccer's to

发表于:2019-02-03 / 阅读(71) / 评论(0) 分类 阅读空间

The money will be repaid by oil shipments to China. The 38 new agreements aim to strengthen economic ties between the two countries in industries such as energy, mining and transportation. Our relations are going into a comprehensive strategic area.

发表于:2019-02-05 / 阅读(109) / 评论(0) 分类 CCTV9英语新闻2014年07月

China' Anhui, a province close to Shanghai, announced its latest property market policy guidance. The guidance calls off all existing market curbs. The province will provide better compensation of land for shanty town residents, and will halt new con

发表于:2019-02-05 / 阅读(78) / 评论(0) 分类 cctv9英语新闻2015年

CARACAS, May 5 (Xinhua) -- The 7th Summit of the Petrocaribe oil alliance opened here on Sunday, with the aim of creating a special economic zone for member states. The meeting has attracted leaders, officials and representatives from the 18 Petrocar

发表于:2019-02-05 / 阅读(65) / 评论(0) 分类 英语新闻

Oklahoma City Thunder superstar Russell Westbrook broke Oscar Robertson's record for triple-doubles in a season in spectacular fashion. 俄克拉荷马雷霆队的超级巨星拉塞尔威斯布鲁克以惊人地方式打破了奥斯卡罗伯特森的单

发表于:2019-02-05 / 阅读(51) / 评论(0) 分类 英语新闻

RIYADH, April 15 (Xinhua) -- The Saudi Industrial Development Fund (SIDF) approved on Monday 10 loans worth over 105 million U.S. dollars to finance the country's industrial projects, according to Saudi Press Agency. The projects include the establis

发表于:2019-02-06 / 阅读(67) / 评论(0) 分类 英语新闻

Britain 英国 Students Loans: A Quick Buck 学生贷款:迅速赚大钱 The government plans to sell out part of the student loan book. 英国政府计划廉价处理部分学生贷款账单 Disposing of government assets is a risky business. 处理

发表于:2019-02-16 / 阅读(67) / 评论(0) 分类 经济学人商业系列

Communiqu of the Twenty-Eighth Meeting of the International Monetary and Financial Committee, Chaired by Mr. Tharman Shanmugaratnam, Deputy Prime Minister of Singapore and Minister for Finance 国际货币与金融委员会第二十八次会议公报

发表于:2019-02-17 / 阅读(87) / 评论(0) 分类 英语笔译

据英国《每日邮报》报道,屏幕解锁应用程序(Locket)通过对15万手机用户监测统计后发现,用户平均每天查看手机大约110次,有些用户一天使用手机18个小时,解锁手机次数高达900次,频率最

发表于:2019-02-18 / 阅读(58) / 评论(0) 分类 英语新闻

Barack Obama lit the National Christmas Tree at the White House for the eighth and final time as president on last Thursday night. 上周四晚上,巴拉克奥巴马第8次在白宫点亮美国国家圣诞树,这也是他作为总统最后一次点

发表于:2019-02-19 / 阅读(70) / 评论(0) 分类 英语美文

Climate change 气候变化 In praise of second best 次好方案获认可 A carbon price would be better, but Barack Obama's plan to cut emissions from power plants is welcome 为碳排放定价显然更为理想,但奥巴马的电厂减排方案依

发表于:2019-02-24 / 阅读(103) / 评论(0) 分类 经济学人综合