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元素化合物知识是中学化学知识构成的基础和骨架。化学基本概念和基础理论的导出，是我们在对元素化合物知识感知、认识的基础上进行的。化学基本概念和基础理论的发展，又要依赖于对元素化合物知识的扩展和深入。同时，化学实验是对元素化合物知识生动的再现和认识，化学计算?
The knowledge of elemental compounds is the basis and skeleton of the composition of chemistry knowledge in middle schools. The derivation of basic concepts and basic theories of chemistry is based on our knowledge and understanding of the knowledge of elemental compounds. The development of basic concepts and basic theories of chemistry depends on the expansion and in-depth knowledge of elemental compounds. At the same time, chemical experiments are a vivid representation and understanding of the knowledge of elemental compounds, chemical calculations?