N-亚硝酰胺

分集介绍:导数,斜率,速度与变化率 Derivatives.slope.velocity.rate.of.change

发表于:2019-01-05 / 阅读(278) / 评论(0) 分类 麻省理工学院公开课:单变量微积分

[全屏观看] 点击右键- 另存为 可保存这个Flash影片 Silly Sausage是Nitrome于2011年5月28日发行的一款益智类游戏,它是以香肠在尽量不碰到其它损失生命物体的情况下吃光所有的钻石再到达终点为标

发表于:2019-01-08 / 阅读(135) / 评论(0) 分类 英语对接游戏

一般而言,男人会与比自己小的女人结婚,女人也乐于嫁给比自己大的男人 Men marry younger women and women prefer to marry older men, in general. But is it culture, genetics or the environment that drives such a choiceand i

发表于:2019-01-21 / 阅读(56) / 评论(0) 分类 阅读空间

HEALTH REPORT - New Heart Drug Shows Promise in African Americans By Cynthia Kirk Broadcast: Wednesday, November 17, 2004 This is Bob Doughty with the VOA Special English Health Report. Heart failure

发表于:2019-01-30 / 阅读(77) / 评论(0) 分类 健康与经济

Today we go on a journey. It starts in Sweden over 100 years ago; and then moves to London; and finally moves to future worlds and other planets. But we start in Sweden. Alfred Nobel spent his life finding ways to blow things up. He was born in 1833

发表于:2019-02-19 / 阅读(60) / 评论(0) 分类 听播客学英语

Voice 1 Hello, Im Ruby Jones. Voice 2 And Im Mike Procter. Welcome to Spotlight. This programme uses a special English method of broadcasting. It is easier for people to understand, no matter where in the world they live. Voice 1 A strong, cold wind

发表于:2019-02-19 / 阅读(71) / 评论(0) 分类 环球英语 Spotlight
学英语单词
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