第二届全国中学生物理竞赛预赛第一试试卷中,有不少既考基础又求灵活;既可卷面笔答也能实验验证;既能从某一方面着手又能引起种种联想的好试题。竞赛题多求巧偏难,而“一试”中不少试题生活气息甚浓,读后学生都想实际试一试,做一做。作为竞赛试题,能做到这一 In the first examination paper of the second national junior high school student physics competition preliminaries, there are many foundations for examination and flexibility; it is possible to test both the face and the face, as well as the experimental verification; The competition questions are more difficult and more difficult, and many of the questions in the “one test” have a strong atmosphere of life. After reading, students want to actually try and do one thing. As a contest question, you can do this