近年来,我们发现同一个物理知识点,会反复不断的命题,从而出现“型异质同”或“型近质同”的试题.从多变的试题中,找出不变的方法,有的放矢的精解和拓宽,提高学生的思维的概括性,乃是教师让学生脱离“题海”的有效途径.下面的案例,就是近年来常见的用来考查学生如何进行受力分析的一个典型试题演变过程. In recent years, we found that the same physical point of knowledge, will be repeated proposition, resulting in “heterogeneous ” or “type of close to ” questions .From the changing questions, find out the same Method, targeted refinement and broaden to improve the generalization of students’ thinking, is an effective way for teachers to get students away from The following case is commonly used in recent years to examine how students are affected A typical test of force analysis evolves.