单词:hydrogen brittleness of copper
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Broadcast: February 14, 2003 By George Grow This is the VOA Special English Environment Report. President Bush has offered a plan to speed development of technology that uses hydrogen as fuel. His goa
发表于:2018-12-07 / 阅读(74) / 评论(0)
VOA2003(上)-科技导航
What Makes Windshield Glass So Tough? We tend to think of glass as fragilebut in fact, glass is pretty strong stuff. A flawless fiber of glass pulled lengthwise is five times stronger than steel! Although glass is quite strong, its also very brittlea
发表于:2018-12-31 / 阅读(40) / 评论(0)
英语听力文摘 English Digest
North Korea conducted a 'successful' hydrogen bomb test, Pyongyang has confirmed. The thermonuclear weapon triggered a massive 5.1 magnitude earthquake when it exploded at 10am local time on Wednesday. 平壤方面已经证实,朝鲜成功的进行了
发表于:2019-02-18 / 阅读(49) / 评论(0)
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