阴极负反馈电阻(器)

访谈录 2013-01-29&01-31 “万能药”阿司匹林副作用多长期服用或失明

There is a big headline tonight about modern health.Forty-three million people are taking some kind of aspirin everyday to prevent heart attacks and strokes,but now the leading medical journal JAMA says there is evidence that daily aspirin could be l

发表于:2019-01-01 / 阅读(132) / 评论(0)

访谈录2013年

SSS 2009-04-06

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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Scientific American(四)月

2007年VOA标准英语-New Treatment Offers Hope for Age-Related Macul

By Melinda Smith Washington 10 July 2007 A recent study in the Journal of the American Medical Association shows that older people who carry certain genes are more susceptible to a loss of their central vision. That loss of sight is an advanced form

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2007年VOA标准英语（七月）

HEALTH REPORT - Progression of Age-Related Macular Degenerat

HEALTH REPORT - Progression of Age-Related Macular Degeneration By Nancy Steinbach Broadcast: Wednesday, January 28, 2004 This is Phoebe Zimmermann with the VOA Special English Health Report. American

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健康与经济

趣味青春英语电台第312期:Run before you can walk

Idiom: Run before you can walk( be patient ) Hit the book： Retinal detachment Macular degeneration Cataract Light sensitivity Blurry Side effect Randomly Respectively Optical And high myopiawhere the eyeball stretches and becomes too longisn't just

发表于:2019-02-16 / 阅读(211) / 评论(0)

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angular distribution of photoelectron