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为什么收集氨气时试管口要塞棉花

更新时间: 2020-09-19 00:00:00     

收集氨气时试管口要塞一团棉花是为了防止空气在试管口处形成对流,塞一团棉花可以提高氨气收集的纯度。

关键词: 为什么 收集 氨气 试管 要塞 棉花

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