某同学利用右图所示装置测定空气中氧气的体积分数.盛放在燃烧匙内的物质是红磷烧杯内的物质是水.1实验结束后打开弹簧夹能观察到什么现象 Template




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tomski某同学利用右图所示装置测定空气中氧气的体积分数.盛放在燃烧匙内的物质是红磷烧杯内的物质是水.1实验结束后打开弹簧夹能观察到什么现象 coloring