1.混合物是由______混合而成;纯净物只由_______组成2.人类维持生命不可缺少,燃料燃烧也离不开的气体是____;约占空气体积的4/5,事业上生产硝酸和化肥的重要原料是__________;_________虽然几乎不
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![1.混合物是由______混合而成;纯净物只由_______组成2.人类维持生命不可缺少,燃料燃烧也离不开的气体是____;约占空气体积的4/5,事业上生产硝酸和化肥的重要原料是__________;_________虽然几乎不](/uploads/image/z/4820132-20-2.jpg?t=1.%E6%B7%B7%E5%90%88%E7%89%A9%E6%98%AF%E7%94%B1______%E6%B7%B7%E5%90%88%E8%80%8C%E6%88%90%EF%BC%9B%E7%BA%AF%E5%87%80%E7%89%A9%E5%8F%AA%E7%94%B1_______%E7%BB%84%E6%88%902.%E4%BA%BA%E7%B1%BB%E7%BB%B4%E6%8C%81%E7%94%9F%E5%91%BD%E4%B8%8D%E5%8F%AF%E7%BC%BA%E5%B0%91%2C%E7%87%83%E6%96%99%E7%87%83%E7%83%A7%E4%B9%9F%E7%A6%BB%E4%B8%8D%E5%BC%80%E7%9A%84%E6%B0%94%E4%BD%93%E6%98%AF____%3B%E7%BA%A6%E5%8D%A0%E7%A9%BA%E6%B0%94%E4%BD%93%E7%A7%AF%E7%9A%844%2F5%2C%E4%BA%8B%E4%B8%9A%E4%B8%8A%E7%94%9F%E4%BA%A7%E7%A1%9D%E9%85%B8%E5%92%8C%E5%8C%96%E8%82%A5%E7%9A%84%E9%87%8D%E8%A6%81%E5%8E%9F%E6%96%99%E6%98%AF__________%3B_________%E8%99%BD%E7%84%B6%E5%87%A0%E4%B9%8E%E4%B8%8D)
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