1　　摘要的定义以提供文献内容为目的 ,不加评论和补充解释 ,简明、确切地记述文献重要内容的短文。2　　摘要的要素1 )目的 :研究、研制、调查等的前提、目的和任务 ,所涉及的主题范围。2 )方法 :应用的原理、理论、条件、对象、材料、工艺、结构、手段、装备、程序等。3)结 1 Summary of the definition To provide the content of the document for the purpose, without commentary and supplementary explanation, concise and accurate description of the important content of the essay. 2 Summary of the elements 1) Purpose: research, development, investigation and other premises, purpose and mission, the scope of the topics involved. 2) Method: Application of the theory, theory, conditions, objects, materials, technology, structure, means, equipment, procedures and so on. 3) knot