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例题(2005年黄冈市)甲、乙、丙是三个实验的示意图,根据图中所发生的化学反应现象及化学反应原理,进行总结归纳并回答下列问题:
The example questions (Huanggang City, 2005) A, B, and C are schematic diagrams of three experiments. Based on the chemical reaction phenomena and chemical reaction principles that occurred in the diagram, they are summarized and answered to answer the following questions: