要物质的化学符号越多越好.如:1.镁在空气中燃烧:2Mg + O2 点燃 2MgO 2.铁在氧气中燃烧:3Fe + 2O2 点燃 Fe3O4 SO2 二氧化硫 H2CO3 碳酸 NaCO3 碳酸钠 不胜受恩感激!

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