单词：eka-erbium
镄
单词：eka-erbium 相关文章
Ytterby 瑞典小镇伊特比 yttrium 钇 (1794) erbium 铒 (1842) terbium 铽 (1842) ytterium 镱 (1907) 1794年在瑞典小镇伊特比的黑石中发现了化学元素钇，决定用 Ytterby命名该元素：yttrium。1842 年在该镇的黑石中发
发表于:2019-02-18 / 阅读(171) / 评论(0)
实用英语
实用英语
By Saqib ul-Islam Washington 12 October 2009 Amreeka's stars, pictured on the movie's promotional poster What is it like for a mother and her teenage son to settle in America? And what if they are Palestinian and their arrival coincides with the ons
发表于:2019-02-20 / 阅读(282) / 评论(0)
VOA标准英语2009年(十月)
VOA标准英语2009年(十月)