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      <description>红磷燃烧实验问题讨论</description>
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      <pubDate>2018-05-23 12:48:30 UTC</pubDate>
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         <description><![CDATA[<div>1.气球有什么作用？有点难<br>2.加热玻璃管是为了引燃<br>3.实验都要检查装置的气密性<br>4.测2次质量是为了比较</div>]]></description>
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         <description><![CDATA[<div>1.气球是为了气压平衡<br>2.加热玻璃管可以使红磷到达着火点<br>3.不检查气密性会有误差<br>4.我觉得测1次也可以，2次更准确</div>]]></description>
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