单词:hydrated calcium uranyl 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
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
2006年VOA标准英语-Aging Chernobyl Survivors Share Memories o
A tornado rips across the Missouri Plains. Winds over 150 miles per hour shred everything in the twister's path. When it smashes a trailer home, one man is sucked into the heart of the storm, spun and shaken horrifically. His limp body drops out of t
你肯定听说过:久坐是新型的吸烟。一项新的研究发现,即使你很活跃,每天在电脑前坐八小时,也会缩短你的寿命。但是现在你可以试着用这些方法来减少你坐的时间,而且也不用把你工作
Hierarchy often within a group of three or more, organization is difficult unless there is a leader. 等级制度一般存在于三人及以上的组织里,若无领导者,组织会出问题。 Hierarchy is a ranking of authority. Often when one