某研究性学习小组的同学为探究空气中氧气的体积分数设计了如图所示装置.请你根据图示实验分析回答下列问题1闭合电源开关可观察到白磷 Template




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tomski某研究性学习小组的同学为探究空气中氧气的体积分数设计了如图所示装置.请你根据图示实验分析回答下列问题1闭合电源开关可观察到白磷 coloring