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课题1空气一、空气组成(1)二百多年前,法国化学家拉瓦锡通过实验,得出了空气由氧气和氮气组成,其中氧气约占空气总体积的1/5的结论。
Topic 1 Air I. Air Composition (1) Two hundred years ago, the French chemist Lavoisier reached the conclusion that air consists of oxygen and nitrogen, and oxygen accounts for about 1/5 of the total air volume.