每种物质都是由特定的粒子构成的如二氧化碳是由二氧化碳分子二氧化碳分子构成的铁是由铁原子铁原子构成的食盐的主要成分氯化钠是由氯离子和钠 Template




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tomski每种物质都是由特定的粒子构成的如二氧化碳是由二氧化碳分子二氧化碳分子构成的铁是由铁原子铁原子构成的食盐的主要成分氯化钠是由氯离子和钠 coloring