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中学地理教学中涉及的等值线主要有:1.等高线和等深线——用于表示地形的高低起伏、地形类型。2.等温线——表示气温的水平分布。3.等压线——表示水平方向上气压高低的分布。4.等降水量线——表示降水量的水平分布(通常是年平均降水量)。另外还有表示太阳辐射地区分布的等值线等等。在这些等值线中,教学、练习、考试时常用的,同时又是初学者难以掌握的是等高线、等温线和等压线。
Contours involved in geography teaching in secondary schools are: 1. Contours and isobaths - used to represent the ups and downs of the terrain and the types of topography. 2. Isotherm - Indicates the horizontal distribution of temperature. 3. Isobars - Indicates the distribution of pressure levels in the horizontal direction. 4. Equal Precipitation Line - Represents the horizontal distribution of precipitation (usually annual average precipitation). In addition there is a map showing the distribution of solar radiation and so on. Among these isosurfaces, the isolines, isotherms and isobars are commonly used in teaching, practice and examinations, and are also difficult for beginners to master.