[化] 一氯化二氯四氨络钴

New Solar Cell Minimizes Environmental Risks in Manufacturing Process 新的太阳能电池减少生产中对环境的危害 Scientists in England report the development of a new solar cell that minimizes environmental risks in the manufacturing proc

发表于:2018-12-08 / 阅读(170) / 评论(0) 分类 VOA标准英语2014年(六月)

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发表于:2019-01-10 / 阅读(287) / 评论(0) 分类 外研社新标准高中英语选修8

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发表于:2019-01-10 / 阅读(278) / 评论(0) 分类 外研社新标准高中英语选修8

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发表于:2019-01-10 / 阅读(280) / 评论(0) 分类 外研社新标准高中英语选修8

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发表于:2019-01-10 / 阅读(214) / 评论(0) 分类 外研社新标准高中英语选修7

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发表于:2019-01-10 / 阅读(215) / 评论(0) 分类 外研社新标准高中英语选修7

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发表于:2019-01-10 / 阅读(265) / 评论(0) 分类 外研社新标准高中英语选修7

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发表于:2019-01-10 / 阅读(309) / 评论(0) 分类 外研社新标准高中英语选修7

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发表于:2019-01-10 / 阅读(226) / 评论(0) 分类 外研社新标准高中英语选修9

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发表于:2019-01-10 / 阅读(220) / 评论(0) 分类 外研社新标准高中英语选修9

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发表于:2019-01-10 / 阅读(412) / 评论(0) 分类 外研社新标准高中英语选修9

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发表于:2019-01-10 / 阅读(414) / 评论(0) 分类 外研社新标准高中英语选修9

DAVID GREENE, HOST: Families across the United States are fighting with the federal government over a deadly chemical. Dozens of people have died from inhaling methylene chloride. This is an ingredient in common paint removers. NPR's Rebecca Hersher

发表于:2019-01-17 / 阅读(172) / 评论(0) 分类 2018年NPR美国国家公共电台11月

Every winter some twenty million tons of salt are dumped on America's road.That sodium chloride melts the ice, so it prevents its formatin, helping to prevent accidents. But road salt has its downside. This is not very economical because salt is main

发表于:2019-01-20 / 阅读(225) / 评论(0) 分类 2016年Scientific American(一)月

This week on Why Tell Me Why, we are finding out why the oceans are so salty. So the oceans are salty because the oceans have been around, lets say, for over five hundred million years. And over the course of time what we found out is that weve alway

发表于:2019-01-22 / 阅读(167) / 评论(0) 分类 自然百科2009年

EDUCATION REPORT - Learning Disabilities, Part 4: Dyspraxia By Nancy Steinbach Broadcast: Thursday, February 26, 2004 This is Steve Ember with the VOA Special English Education Report. People who have

发表于:2019-01-30 / 阅读(197) / 评论(0) 分类 教育与新闻

Tony: Who did you invite over for dinner Saturday? Carmela: I invited Keith, Sung, Stephanie, and Luis. Tony: You didnt! Carmela: I did. Why? Tony: Youre going to have a hard time cooking for them. Keith is a vegan and only eats food thats organic. S

发表于:2019-02-04 / 阅读(153) / 评论(0) 分类 地道美语播客

This is Search Engine Optimization Explained by Common Craft. 本期介绍搜索引擎优化。 Imagine for a minute that youre a librarian, but not a normal one. Youre a librarian for every book in the world. 假设你是名超级图书管理员,管

发表于:2019-02-05 / 阅读(139) / 评论(0) 分类 英语万花筒

本期内容: A stolen bottle of vodka thought to be the world's most expensive at $1.3m has been found empty on a construction site, Danish police say.The bottle, made from gold and silver and with a diamond encrusted cap, was on loan to a Copenha

发表于:2019-02-11 / 阅读(137) / 评论(0) 分类 夏说英语新闻晨读

First off, I'll mention that at the bottom of the sea there exist veins of zinc, iron, silver, and gold whose mining would quite certainly be feasible. 首先,我对您说,海底有锌、铁、银、金等矿藏,开发并不是不可能的事。

发表于:2019-02-25 / 阅读(266) / 评论(0) 分类 《海底两万里》中英双语有声读物
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