单词：sintered phosphate
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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(184) / 评论(0)
医务英语
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(227) / 评论(0)
Scientific American(四)月
Scientific American(四)月