重计算、轻概念，这是一些学生学习物理的通病．例如，对于密度的知识，计算方面同学们不会感到困难，但碰到概念性的问题就很难说了．对待概念问题，不是“背”和“记”就能解决的，更重要的是深刻理解它．有这样一道很常见的选择题：物质的密度可用户一n。／y来计算，于是有 Re-calculation, light concept, this is a common problem of some students learning physics. For example, for the knowledge of density, the students will not feel any difficulty in calculating, but it is difficult to say that they encounter conceptual problems. Treating conceptual issues is not a matter of “backing” and “remembering,” but more importantly, understanding it. There is a very common multiple-choice question: the density of the material can be used by the user. /y to calculate, so there are