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Universal Instrument traces its roots to the Universal Instruments and Metal Company, a safety pin manufacturer founded in 1919. Through time, the company discontinued safety pin production and made a transition to a machining and tool and die busine
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
This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Common batteries are electrochemical cells. And they may get better thanks to living cells: the multicellular organism called brown algae. Lithium ion
金属切削 metal cutting 机床 machine tool 金属工艺学 technology of metals 刀具 cutter 电路 circuit 半导体元件 semiconductor element 反馈 feedback 发生器 generator 直流电源
音乐咖啡厅:Some Any - Mechanical heart 相关介绍:各国都有各种各样的乐坛新秀选拔大赛,Some Any这支一男一女的流行团体则是来自德国的一支通过选秀节目发迹的乐团,两个人分别是年仅十八岁的