单词:erbium fiber amplifier
铒光纤放大器
单词:erbium fiber amplifier 相关文章
A: Something's wrong with my computer. B: What's the problem? A: My computer won't turn on. B: Did you see if all the connections are right? A: I'm not sure I understand what you mean. B: The connections between your CPU and your outlet. A: Is that w
发表于:2018-11-30 / 阅读(124) / 评论(0)
英语情景对话-日常生活
2 What are the two speakers doing? [A] Walking down a hill [B] Climbing stairs [C] Discussing a trip
发表于:2018-12-30 / 阅读(60) / 评论(0)
听听测测
3 Where are the two speakers? [A] In a restaurant [B] On a farm [C] At the man's home
发表于:2018-12-30 / 阅读(58) / 评论(0)
听听测测
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(38) / 评论(0)
实用英语