时间问题是中学地理教材的一个难点,近年来的高考试题都有这方面的内容,因而,受到中学师生的普遍重视。为此,我想谈谈解决时间计算问题的几个关键。一、时间计量系统的建立时间是物质存在的基本形式之一,它只有在物质运动中才显示其作为客观存在的本质。一个有稳定周期并作延续周期运动的物体适于作为计量时间的依据。同时依据这一 The problem of time is a difficult point in middle school geography textbooks. The high test questions in recent years all have this aspect. Therefore, they are generally valued by teachers and students in middle schools. For this reason, I would like to talk about several key points for solving the problem of time calculation. First, the establishment of the time measurement system is one of the basic forms of material existence. It only shows its essence as an objective existence in the material movement. An object with a stable period and a continuation period is suitable as a basis for the measurement time. Also based on this