所谓估算,实质是根据物理概念和规律,运用物理方法对所求物理量进行大致的、合理的推算。它要求考生在分析和解决问题时,善于抓住主要因素,忽略次要因素,巧用物理方法,迅速得到合理的结果。一般地,估算有如下切入点:淤用生活经验进行估算;于用物理常 The so-called estimation, in essence, is based on the concept and laws of physics, the physical method of using physical quantities for a rough, reasonable projections. It requires candidates to analyze and solve problems, good at seizing the main factors, ignoring the secondary factors, clever use of physical methods, quickly get a reasonable result. In general, the estimation has the following entry points: silt is estimated by living experience;