“一题多变”既能帮学生理清概念,又能节约复习时间,使课堂成为高效课堂。用好、用透每一道题,将题目连成串,层层深入,使学生将物理知识也连成串,提高学生的综合解题能力。 “A question changeable ” can not only help students to clarify the concept, but also save time for review, make the classroom an efficient classroom. With good, thoroughly through each question, the topic even into a string, layers of depth, so that students will even physical knowledge into a string, improve students’ ability to solve problems.