一、自学目的1、了解石油的特性及其用途。2、学习条理清晰、详略得当、经纬分明地说明事物的方法.3、学习比较说明法。二、自学提示1、通读全文,划分部分.这是一篇科技说明文,它比较全面地介绍了石油的特性和用途,同时也给我们以深刻的启示:要刻苦攻关,不断地向大自然的深度和广度进军,开发利用自然资源,加速四化建设. First, self-study purposes 1. Understand the characteristics of oil and its use. 2. Learn methods that are clear, detailed, and well-defined in terms of latitude and longitude. Second, self-study tips 1, read the full text, divided part. This is a science and technology exposition, it more comprehensively introduces the characteristics and uses of oil, but also gives us a profound revelation: to work hard, constantly to nature’s Depth and breadth to enter, develop and use natural resources, accelerate the construction of four modernizations.