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哪些事实说明空气中含有氮气
更新时间: 2020-06-30 00:00:00  

1、制氮肥需要氮气,说明空气中含有氮气;

2、种植豆科植物的土地一般不施用氮肥而含氮量较高,说明空气中含有氮气;

3、从空气中可以分离制得氮气,说明空气中含有氮气。

关键词: 哪些 事实 说明 空气 含有 氮气

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