单词：quinine hrdrochlorphosphate
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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
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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
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PEOPLE IN AMERICA -June 2, 2002: Cochise By Vivian R. Bournazian VOICE ONE: PEOPLE IN AMERICA, a program in Special English on the Voice of America. (THEME) During the eighteenth century Indians tried
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A British parliament committee said Tuesday newspaper and television magnate Rupert Murdoch is not a fit person to head a media company, part of an unexpectedly strong rebuke to one of the world's most powerful media moguls. The multy-party committee
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WASHINGTON, June 25 (Xinhua) -- Ryan Lochte edged Michael Phelps in the men's 400m individual medley at the US Olympic swimming trials Monday. Lochte took the lead on the breaststroke leg of the four-stroke event and held off Phelps in the closing fr
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