高中物理.有关于无数个质点组成的连续介质问题,解这类问题,困难在选取研究对象和运用物理规律.注意分类,有助于走出困境. High school physics. There are numerous questions about the continuum medium composed of many particles. To solve this type of problem, it is difficult to select the research object and use the laws of physics. Pay attention to the classification and help to get out of the predicament.