经过1991年到1993年三届全国应用物理知识竞赛,展现在我们面前的是一批具有典型性代表性的与生活、生产实际联系紧密的应用物理知识题,近年来一些刊物上也有为数不少的这类习题。解答这类题,不仅要灵活、准确的应用所学物理知识去分析、判断和计算,而且要尽快找出巧妙的解答方法,才能在最短时间里将问题解决。这就要求同学们做 After the three sessions of the National Applied Physics Knowledge Contest from 1991 to 1993, what appeared before us was a group of representative physics topics that were closely related to life and production. In recent years, there have been a number of publications. This kind of exercise. To answer such questions, you must not only use the learned physics knowledge to analyze, judge, and calculate flexibly and accurately, but also find out the ingenious solutions as soon as possible so as to solve the problem in the shortest possible time. This requires students to do