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

An Indiana teen's family used throwing the state Athletic Association a curve ball. 14-year-old Logen Young wants to try out for the boys' baseball team without any preconditions; A state rule says she can't, so her parents have filed a lawsuit. It s

发表于:2018-12-11 / 阅读(62) / 评论(0) 分类 万花筒2008年

After getting a massive infection, it looked like that Franklin Lloyd would lose his right leg. Aggressive antibiotic treatments just werent working and the infection kept spreading wider and deeper. The 67-year-old kidney transplant recipient has a

发表于:2018-12-11 / 阅读(98) / 评论(0) 分类 万花筒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

中文 英文 缩写 堡垒主机 dual-homed gateway 报警打印输出 alarm printout 报警显示 alarm display 报警箱/盘 alarm box 报警信号 alarm signal 报头 header 报头开始字符 Sta

发表于:2019-01-08 / 阅读(143) / 评论(0) 分类 电信英语

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

新西兰一位亚裔男子在申请护照时上传照片被拒,因为计算机软件认为他在照相时没有睁开眼睛。新西兰内政部发言人说,网上审查照片的拒绝率高达20%,通常的原因是照相闭眼。 A New Zealan

发表于:2019-02-01 / 阅读(58) / 评论(0) 分类 阅读空间

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

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

Never mess with your spouse's online shopping. 绝不要搞砸你另一半的网购! A husband learned the hard way after he was forced to kneel outside his door in his long johns for secretly returning all his wife's Singles' Day purchases. 在一位

发表于:2019-02-06 / 阅读(70) / 评论(0) 分类 英语美文

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

A man in Zhangzhou, Fujian province is facing prosecution after a thief he chased dropped dead on the street. 福建漳州一名男子即将被起诉,原因是他在追赶一名小偷时,后者不幸摔倒死亡。 The case has elicited widesprea

发表于:2019-02-18 / 阅读(49) / 评论(0) 分类 英语新闻

A man in his sixties climbed the cables of the Second Yangtze River Bridge in Wuhan, Hubei province. Standing 30 meters above the deck of the bridge, the man threatened to jump. 据报道,湖北武汉一名六旬男子日前爬上了长江二桥斜拉

发表于:2019-02-18 / 阅读(110) / 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(104) / 评论(0) 分类 经济学人综合