编者：认识不相同的物理概念的相同点前面已经说过，通过比较，看清越是相近的物理概念的相异点，意义越重大．现在说一说相反的情况，通过比较，认识越是不同的物理概念的相同点，意义越是重大．思维开阔，举一反三，这种功夫得益于此多多．本文复习的物质的密度和前面复习的? Editor: Recognizing the similarities of dissimilar physical concepts As we have already mentioned, by comparison, it is clear that the more physical the concept is, the more significant it is. Now that we talk about the opposite situation, through comparison, understanding the same points of different physical concepts, the more significant the significance. Thinking broadly, taking it as an example, this kind of kung fu benefits a lot. This article reviews the density of the material and the previous review?