1.下列物质属于纯净物的是( )A冰和水的混合物B食盐水C洁净的空气D含铁质量分数为30%的三氧化二铁2.某物质在纯氧中燃烧生成了氮气和水蒸气,该物质一定含有( )A氮元素和氧元素B氢元素
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![1.下列物质属于纯净物的是( )A冰和水的混合物B食盐水C洁净的空气D含铁质量分数为30%的三氧化二铁2.某物质在纯氧中燃烧生成了氮气和水蒸气,该物质一定含有( )A氮元素和氧元素B氢元素](/uploads/image/z/1444824-0-4.jpg?t=1.%E4%B8%8B%E5%88%97%E7%89%A9%E8%B4%A8%E5%B1%9E%E4%BA%8E%E7%BA%AF%E5%87%80%E7%89%A9%E7%9A%84%E6%98%AF%EF%BC%88+%EF%BC%89A%E5%86%B0%E5%92%8C%E6%B0%B4%E7%9A%84%E6%B7%B7%E5%90%88%E7%89%A9B%E9%A3%9F%E7%9B%90%E6%B0%B4C%E6%B4%81%E5%87%80%E7%9A%84%E7%A9%BA%E6%B0%94D%E5%90%AB%E9%93%81%E8%B4%A8%E9%87%8F%E5%88%86%E6%95%B0%E4%B8%BA30%25%E7%9A%84%E4%B8%89%E6%B0%A7%E5%8C%96%E4%BA%8C%E9%93%812.%E6%9F%90%E7%89%A9%E8%B4%A8%E5%9C%A8%E7%BA%AF%E6%B0%A7%E4%B8%AD%E7%87%83%E7%83%A7%E7%94%9F%E6%88%90%E4%BA%86%E6%B0%AE%E6%B0%94%E5%92%8C%E6%B0%B4%E8%92%B8%E6%B0%94%2C%E8%AF%A5%E7%89%A9%E8%B4%A8%E4%B8%80%E5%AE%9A%E5%90%AB%E6%9C%89%EF%BC%88+%EF%BC%89A%E6%B0%AE%E5%85%83%E7%B4%A0%E5%92%8C%E6%B0%A7%E5%85%83%E7%B4%A0B%E6%B0%A2%E5%85%83%E7%B4%A0)
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