57. Were it not for the feather lost in departure, no one would have known that the white bird had ever been.
58. Sir Isaac Newton was one of the pioneers in investigating viscosity, and on his analysis depends the definition of the coefficient.
59. A widely known achievement of radio electronics is an electronic calculating machine that can perform several thousand arithmetical operations in one second.
60. Nearly all our clothes are made from fibres of one sort or another, be they deried from plants, animals, coal or petroleum and all these fibres, when they are carefully examined, are seen to consist of long chain molecules.
第一章定语从句
1,图书馆的出现使教育的发展成为可能,而教育的发展又反过来使图书馆不断扩大充实。知识的增长遵循了一种复利法则。由于印刷术的发明,这一知识增长过程得以大大加速。
2,如果他们每个人都能予以信任来承担这样的职责,并在他们所管辖的范围内发挥主动性,那么管理费用就会降低。
3,迟早可能不存在我们想得出但解答不了的问题,甚至包括我们意识到的问题。
4,至少由于氢弹、弹道导弹和登月火箭出人意料地发明,那个历史时期宣告结束了。
5,关于威德尔海豹特殊的生理机制,在实验室里对其进行的研究已作过详细的描述。该生理机制使海豹可以适应长时间潜水时出现的极度缺氧。海豹长时间潜水时最深可达水面以下500米,时间可持续70多分钟。
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