1, the abstract is the main content of the article, and the preface is the preface that leads to the topic, which is different. \x0d\2。 Abstract is a short article, which describes the important contents of the document concisely and accurately, with the purpose of providing a summary of the contents of the document without comments or supplementary explanations. \x0d\3。 The preface mainly explains the basic content, writing intention, writing process, academic value and author's brief introduction of this book. \x0d\4。 It should be independent and self-evident, and have the same amount of information as the literature, that is, you can get the necessary information without reading the full text. \x0d\5。 The preface should come straight to the point, not beat around the bush; Concise and focused; Looking back at history, we should focus on the content, closely follow the title of the article and introduce the background around the title. \x0d\ For more information about the preface and abstract of the paper, please visit:/ask/d62aaf1615822049.html? Zd view more content