综观2012年全国及各省市的高考地理试题,有关等值线的试题出现的频率特别高。等值线极具多变性和综合性,能够很好地体现高考的指导思想。掌握等值线图的判读方法,了解等值线试题的备考方向,对于高三地理复习十分重要。一、等值线图判读的一般规律1.同一条等值线上各点数值相等。2.同一幅等值线图中,相邻两条等值线的差值相同或者为零。如下面四幅图为等压线 Looking at 2012 college and university entrance exam geography examination questions, the frequency of the test questions appear particularly high frequency. Isoline is highly variable and comprehensive, can well reflect the guiding ideology of the college entrance examination. Master contour map interpretation method, to understand the contour test pro forma direction, geography review for the third year is very important. First, the general law of interpretation of contour map 1. The same value of each point on the same value. 2. In the same contour map, the difference between two adjacent contour lines is the same or zero. The following four pictures are isobars