求物理量的比，常在填充题和选择题中出现，由于这类习题的解答比较繁难，所以初学物理的学生都怕解这类习题．下面以几条习题为例，谈谈解物理量之比的习题的几种方法．一、相同物理量替代法相同的物理量替代法解比的习题，是将习题中的已知条件，化成一个物体的物理量表示另 The ratio of physical quantities often appears in filled-in and multiple-choice questions. Because the answers to these types of exercises are more difficult, beginner physics students are afraid of solving such exercises. Take several exercises as an example below to talk about several ways to solve the problems of physical ratio. First, the same physical quantity substitution method uses the same physical quantity as the method for solving the problem. It is to convert the known conditions in the exercises into the physical quantity of an object.