在历年高考中,几乎年年考查等值线的知识。等值线的类型很多,中学地理中需要同学们掌握的主要有:等高线、等温线、等压线、等降水量线、等太阳高度线、等太阳辐射线、等震线、等盐度线、等PH值线、等岩石年龄线等等。近几年高考试题中还出现了等时线、等水汽压线、等运费线、等地租线等。凡是用数值来表示地理特征空间分布的知识,都可用等值线的形式来呈现。一、破解等值线的一般方法 1.等差距 In the calendar year college entrance examination, almost every year to test the knowledge of the contour. There are many types of contour lines. Students in secondary geography need to master the following main courses: contour lines, isotherms, isobaric lines, precipitation lines, and other solar elevation lines, such as solar radiation lines, isoseismic lines, and other salts Degree line, such as PH line, such as rock age line and so on. In recent years, entrance exam questions also appeared isochron, such as water vapor pressure line, such as freight lines, rent lines and other places. Any knowledge of numerical distribution of spatial distribution of geographic features can be presented in the form of contour lines. First, the general method of breaking the contour 1. Equal distance