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pH - a measure of how acid or alkali a solution is. As the pH gets lower, the solution is more acid. At a pH of 7 the solution is neither acid nor alkali. pH is the inverse of the logarithm of the con

发表于:2019-01-03 / 阅读(162) / 评论(0) 分类 医务英语

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Batteries of the future need to deliver more energy, and they need to be smaller. Researchers at MIT think they have developed a technology that can, a

发表于:2019-01-08 / 阅读(194) / 评论(0) 分类 Scientific American(四)月

Science and Technology 科技 Rare earths and climate change 稀土与气候变化 In a hole? 陷入了危机? Demand for some rare-earth elements could rapidly outstrip supply 某些稀土元素可能很快会供不应求 MANY plans for reducing t

发表于:2019-02-07 / 阅读(137) / 评论(0) 分类 经济学人综合
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